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• Loss of wireless network connectivity when playing video via HDMI cable

  - by Jeff Fohl

  Hi Folks - New to Super User, so I hope this question fits in with the guidelines. Very strange problem I am having, and I am at a loss as to how to continue troubleshooting this one. The basic problem is that when I attempt to watch streamed video on a particular display device (an Optoma HD180 projector), my network connectivity drops like a stone to barely measurable levels. This is my setup: I have a Dell H2C 730x running Windows 7 64bit. This particular computer has two ATI Radeon HD 4800 video cards. I have two Samsung 22" monitors connected to one card, and an Optoma HD180 digital projector connected to the other card via an HDMI cable. My internet connection is normally a reliable 6Mbps. The problem I am having occurs when I stream video (or even just browse the web) on the Optoma Projector. When I do this, my internet connection drops to practically zero (just a few kilobits per second). When I move the browser away from the projector, and over to one of my Samsung monitors, the internet connection comes right back. Note that the Optoma projector is on and enabled as a third monitor all this time. I can move the mouse around on the projector without triggering the problem. I tried pinging my router when I was playing a movie on one of the monitors, and I get a 1 millisecond response. However, when I have the movie playing on the Optoma projecter, pinging the router gives me response times in the hundreds of milliseconds, or times out completely. So, it clearly is something local to my machine - and not some sort of throttling occurring down the line. I would think that it is possibly something to do with the HDMI driver conflicting somehow with my network driver (which is a USB-based wireless connection). This one has me really stumped. Anyone have any ideas? EDIT: I am now leaning towards the possibility that the HDMI cable is somehow interfering with the wireless network, when large amounts of data are being pushed through the cable. Is this possible?

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• Postfix + SASLAUTHD + MySQL authentication problems

  - by Or W

  I've been trying to sort this out for the past 6 hours or so, this is the error message I'm facing (Running CentOS x64): /var/log/maillog: Jun 22 20:42:49 ptroa postfix/smtpd[10130]: warning: SASL authentication failure: Password verification failed Jun 22 20:42:49 ptroa postfix/smtpd[10130]: warning: bzq-79-177-192-133.red.bezeqint.net[79.177.192.133]: SASL PLAIN authentication failed: authentication failure Jun 22 20:42:49 ptroa postfix/smtpd[10130]: warning: bzq-79-177-192-133.red.bezeqint.net[79.177.192.133]: SASL LOGIN authentication failed: authentication failure /var/log/messages: Jun 22 20:15:38 ptroa saslauthd[9401]: do_auth : auth failure: [user=myuser] [service=smtp] [realm=domain.com] [mech=pam] [reason=PAM auth error] I have dovecot installed as well and I'm able to receive emails via the MySQL authentication. The problem is when I'm trying to use SMTP to send out emails. Some config files: /etc/postfix/main.cf: # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. myorigin = /etc/mailname smtpd_banner = Server Message biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = /usr/share/doc/postfix # TLS parameters smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_key_file = /etc/postfix/smtpd.key smtpd_use_tls = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = domain.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all html_directory = /usr/share/doc/postfix/html message_size_limit = 30720000 virtual_alias_domains = virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, mysql:/etc/postfix/mysql-virtual_email2email.cf virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf virtual_mailbox_base = /home/vmail virtual_uid_maps = static:5000 virtual_gid_maps = static:5000 smtpd_sasl_auth_enable = yes broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination virtual_create_maildirsize = yes virtual_maildir_extended = yes proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_cano$ virtual_transport = dovecot dovecot_destination_recipient_limit = 1 /etc/default/saslauthd: START=yes DESC="SASL Authentication Daemon" NAME="saslauthd" MECHANISMS="pam" MECH_OPTIONS="" THREADS=5 OPTIONS="-c -m /var/spool/postfix/var/run/saslauthd -r" /etc/pam.d/smtp: #%PAM-1.0 #auth include password-auth #account include password-auth auth required pam_mysql.so user=mail_admin passwd=password host=127.0.0.1 db=mail table=users usercolumn=email passwdcolumn=password crypt=1 verbose=1 account sufficient pam_mysql.so user=mail_admin passwd=password host=127.0.0.1 db=mail table=users usercolumn=email passwdcolumn=password crypt=1 verbose=1

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• freebsd-update from 8.3-RELEASE to 9.0-RELEASE: How to deal with dozens of diffs?

  - by Stefan Lasiewski

  I am upgrading a FreeBSD 8.3-RELEASE system to FreeBSD 9.0-RELEASE using freebsd-update. This is my first time performing a major version upgrade in FreeBSD. At one point in the process, freebsd-update performs a diff on files which are different then what is expected for the 9.0-RELEASE. It compares the current version on the system with the new changes added from 9.0-RELEASE. There are dozens of files in the list. Thus, I am presented with dozens and dozens of diffs which open in a vi window and look like this: The following file could not be merged automatically: /etc/ntp.conf Press Enter to edit this file in vi and resolve the conflicts manually... ### vi window opens <<<<<<< current version driftfile /etc/ntp/drift ======= # # $FreeBSD: release/9.0.0/etc/ntp.conf 195652 2009-07-13 05:51:33Z dwmalone $ # # Default NTP servers for the FreeBSD operating system. # # Don't forget to enable ntpd in /etc/rc.conf with: # ntpd_enable="YES" # # The driftfile is by default /var/db/ntpd.drift, check # /etc/defaults/rc.conf on how to change the location. # >>>>>>> 9.0-RELEASE restrict default notrust nomodify ignore And so on. This requires that I manually edit each file and remove the strings like <<<<<<< current version >>>>>>> 9.0-RELEASE and =======. As I discovered afterwards, if I don't remove these strings, they end up in the file afterwards. There are dozens of files which differ between 8.3 and 9.0, and I have a dozen local modifications myself. It appears that freebsd-update is using a diff, sdiff or mergemaster function of some sort, but I can't tell what it is doing exactly. Processing these files is tedious. Is there a way that I can just say "Accept new version" or "keep old version" or "Your merge is correct"? There has got to be an easier way to deal with these files. I must be missing something. This isn't a huge problem for one machine, but eventually I'll be doing this dozens of times and I want to find an easier way.

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• How to rate-limit concurrent sessions with nginx or haproxy?

  - by bantic

  I'm currently using nginx to reverse-proxy requests from web clients that are doing long-polling to an upstream. Since we're doing long polling (as opposed to websockets), when a client connects it will make multiple http connections to the server in serial, re-establishing a connection every time the server sends it some data (or timing out and re-establishing if the server has nothing to say for 10 seconds). What I'd like to do is limit the number of concurrent web clients. Since the clients are constantly making new HTTP requests instead of keeping a single request open, it's a little tricky to count the total number of web clients (because it's not the same as total number of concurrently connected http clients). The method I've come up with is to track http requests by the originating IP address, and store the IP address somewhere with a TTL of 20 seconds. If a request comes in whose IP isn't recognized, then we check the total number of unexpired stored IP addresses; if that's less than the maximum then we allow this request through. And if a request comes in with an IP address that we can find in the look-up table that hasn't yet expired, then it is allowed through as well. All requests that are allowed through have their IPs added to the table (if not there before) and the TTL refreshed to 20 seconds again. I had actually whipped something together that worked correctly this way using nginx along with the Redis 2.0 Nginx Module (and the nginx lua module to simplify the conditional branching), using redis to store my IP addresses with a TTL (the SETEX command), and checking the table size with the DBSIZE command. This worked but the performance was horrible. nginx and redis ended up using lots of cpu and the machine could only handle a very small number of concurrent requests. The new stick-table and tracking counters that were added to Haproxy in version 1.5 (via a commission from serverfault) seem like they might be ideal to implement exactly this sort of rate limiting, because the stick-table can track IP addresses and automatically expire entries. However, I don't see an easy way to get a total count of the unexpired entries in the stick table, which would be necessary to know the number of connected web clients. I'm curious if anyone has any suggestions, for nginx or haproxy or even for something else not mentioned here that I haven't thought of yet.

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• Windows 7 Home hangs at "Welcome" screen

  - by White Phoenix

  I'm asking on behalf of a friend who's currently having problems with his machine. Windows 7 Home 32-bit. He's too far away for me to help by going over to his house - I'm helping him over the Internet. This is his current machine: http://www.newegg.com/Product/Product.aspx?Item=N82E16883227134 The only two changes he made to that machine is to swap out the gfx card for a EVGA GTX 460 and the PSU for a Corsair TX650. Here's what happened: He was playing a computer game (fairly CPU/GPU intensive) and had some music going in the background in foobar while playing. Suddenly, he notices the music stopped playing, so he switches to foobar to try to close it, but it freezes up (window won't respond). So he figures it's just foobar having a bad day and force quits that program. Suddenly, his game won't respond, so he force quits that, then the entire computer just went to crap at that point, so he hits the restart button on his machine. Computer POSTS fine, but now he gets stuck at the Windows "welcome" screen (his account is set to auto-login). HD activity light is solid yellow but he doesn't hear HDD activity. He tried booting into Safe Mode - gets stuck at the "welcome screen". Tried a STartup Repair within Windows 7, it found a few problems, but still gets stuck at welcome. I advised him to boot off the DVD - sfc /scannow found nothing (couldn't use the regular /scannow option; says there's a repair pending, had to use use offbootdir/offwindir command switches). Ran startup repair 3 times - found nothing. My friend runs virus/malware scans on a regular basis, so he's fairly sure it's not that either. Right now I'm having my friend run chkdsk /R on the computer while in this Startup Recovery mode - so far it's caught a few bad sectors. However at this point I'm kinda wondering which way to go if chkdsk doesn't fix it. Quick Google search said someone had success by booting Windows with bootlogging on - some others have success with running the aforemented chkdsk, etc. The fact that Windows cannot even boot into Safe Mode concerns me. While we're waiting for chkdsk /R to finish, are there any other options I can give my friend short of reinstalling Windows 7? He has his data on a separate partition so that's not a major problem (though it'll be an annoyance for him). I suspect his hard drive may be having some issues, but my main concern is getting him back up and running before we start diagnosing the hard drive (I may have him run some sort of SMART test utility later).

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• 2xAMD Opteron 6128 with libvirt, Physical CPU 13 doesn't exist

  - by yak

  I need help with libvirt(?) problem. Server specs: ProLiant DL165 G7 2x AMD Opteron(tm) Processor 6128 System: Debian GNU/Linux testing (wheezy) 3.2.0-3-amd64 libvirt 0.9.12-5 kvm 1:1.1.2+dfsg-2 $ grep processor /proc/cpuinfo | wc -l 16 $ virsh nodeinfo setlocale: No such file or directory CPU model: x86_64 CPU(s): 16 CPU frequency: 800 MHz CPU socket(s): 2 Core(s) per socket: 4 Thread(s) per core: 1 NUMA cell(s): 1 Memory size: 66114200 KiB $ virsh capabilities .. <topology> <cells num='4'> <cell id='0'> <cpus num='4'> <cpu id='0'/> <cpu id='1'/> <cpu id='2'/> <cpu id='3'/> </cpus> </cell> <cell id='1'> <cpus num='4'> <cpu id='4'/> <cpu id='5'/> <cpu id='6'/> <cpu id='7'/> </cpus> </cell> <cell id='2'> <cpus num='4'> <cpu id='12'/> <cpu id='13'/> <cpu id='14'/> <cpu id='15'/> </cpus> </cell> <cell id='3'> <cpus num='4'> <cpu id='8'/> <cpu id='9'/> <cpu id='10'/> <cpu id='11'/> </cpus> </cell> </cells> </topology> .. $ virsh vcpupin vm 0 13,12,11,10,9,8,7,6,5 error: Physical CPU 13 doesn't exist. error: cpulist: Invalid format. Question? Why my VM Guests use only first 8 CPUs and next 8 are idling? $ for host in virsh list | awk '{print $2}'; do virsh vcpuinfo $host; done | grep ^CPU: | sort | uniq CPU: 0 CPU: 1 CPU: 2 CPU: 3 CPU: 4 CPU: 5 CPU: 6 CPU: 7 Any ideas how to change it?

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• How should I use my new SSD drive?

  - by jasondavis

  I just built a new PC the other day. Specs... Processor: Intel i7-930 quad core CPU CPU Cooler: COOLER MASTER Hyper 212 Motherboard: AsRock X58 Extreme 3 RAM/Memory: 6gb G-Skill tripple channel DDR3 memory (3 sticks of 2gb planning to get another kit to make it 12gb total soon) Operating System Hard drive: Intel X25-M 80GB Mainstream SATA2 Solid State Drive Video Cards: 2 XFX ATI Redeon HD 4650 cards to run 3-4 monitors Case: Lian Li PC-B10 Midtower case Power Supply: Antec TruePower New TP-750 Blue 750W Operating System Windows 7 Pro 64bit Not sure if the specs are helpful at all but I posted them just in case. So I got everything put together and running great so far but I need some advice/ideas/help/tips. I got the SSD drive in hopes of using it strictly for my windows 7 install along with all my other programs I install. I am then going to get another drive or 2 just for data (video,music,photos, etc). So my plan is to just install the new data drives and then in windows 7 I will change my "My documents" "My Music" "My Video" "MY Photos" library's to be located on the data drives instead of the OS SSD drive. I would ultimately like to install all my programs with my windows install on the SSD drive and then create an IMAGE of the drive and then 6 months down the road if things are sluggish I can just wipe the drive and restore my IMAGE with all my programs and settings in tact still. So here are some questions now. 1) How can I verify that TRIM is working on my new SSD? 2) Is there anything above that I missed that I should be doing? I think I once read that there is a page file or some sort of file that windows changes a lot and that it should be moved off f an SSD an onto my data drives. DOes anyone know what I might of heard? If you do can you explain the pros and cons of doing such a thing as well as how to possibly? 3) Any tips or advice to get the best performance from all this, I built a pretty nice system and I just want to make it stay that way as long as I can.

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• Got Hacked. Want to understand how.

  - by gaoshan88

  Someone has, for the second time, appended a chunk of javascript to a site I help run. This javascript hijacks Google adsense, inserting their own account number, and sticking ads all over. The code is always appended, always in one specific directory (one used by a third party ad program), affects a number of files in a number of directories inside this one ad dir (20 or so) and is inserted at roughly the same overnight time. The adsense account belongs to a Chinese website (located in a town not an hour from where I will be in China next month. Maybe I should go bust heads... kidding, sort of), btw... here is the info on the site: http://serversiders.com/fhr.com.cn So, how could they append text to these files? Is it related to the permissions set on the files (ranging from 755 to 644)? To the webserver user (it's on MediaTemple so it should be secure, yes?)? I mean, if you have a file that has permissions set to 777 I still can't just add code to it at will... how might they be doing this? Here is a sample of the actual code for your viewing pleasure (and as you can see... not much to it. The real trick is how they got it in there): <script type="text/javascript"><!-- google_ad_client = "pub-5465156513898836"; /* 728x90_as */ google_ad_slot = "4840387765"; google_ad_width = 728; google_ad_height = 90; //--> </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> Since a number of folks have mentioned it, here is what I have checked (and by checked I mean I looked around the time the files were modified for any weirdness and I grepped the files for POST statements and directory traversals: access_log (nothing around the time except normal (i.e. excessive) msn bot traffic) error_log (nothing but the usual file does not exist errors for innocuous looking files) ssl_log (nothing but the usual) messages_log (no FTP access in here except for me)

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• Virtualbox - routing subnet to bridge adapters

  - by user42384

  Hello, I have set up a Debian Lenny box with 3 vbox Lenny machines running eth0 of the host in bridged mode (on virtualbox 3.1.6). When testing in my local LAN, this all worked perfectly well and traffic flowed to and from the IPs of the virtual machines as it should. However, now that it's in its co-lo home, the networking setup is a bit different, and I'm unable to get traffic to flow to the vboxes properly. Specifically, the host has its own Primary IP, and I have a separate subnet of 8 (6 usable) IPs routed to the box for use by the vboxes. So, eth0 on host is: Machine IP: 2x.x.x.137 Gateway IP: 2x.x.x.138 Subnet Msk: 255.255.255.252 Subnet for vboxes is Subnet: 2x.x.x.240/29 Netmask: 255.255.255.248 vbox1 is configured to 2x.x.x.241 on eth0 as follows: auto eth0 iface eth0 inet static address 2x.x.x.241 netmask 255.255.255.248 Setting up a virtual interface (eth0:0) on the host with one of these subnet IPs allows me to ping to that address only from vbox1, and it allows me to ping vbox1 from the host. I can also ping that virtual interface perfectly well from outside, so the IPs are definitely landing at my machine. It seems I'm missing some sort of routing instruction either on the host or vbox1 to get traffic moving between the subnet and the default gateway, but I can't seem to figure out what it should be, or what glaringly obvious thing i'm missing. Most of my obvious attempts (the gw of eth0, the ip of eth0) were rejected by route command with SIOCADDRT: No such device (eg - i can't find it). I tried setting vbox1 to bridge on eth0:0, but this was not an acceptable device name and VBoxHeadless refused to start. The physical machine does have an unused physical NIC at eth1 that can be used if necessary for something or other. Host machine is running iptables configured by ferm, have experimented with it allowing forwarding for that subnet, but I wouldn't have thought this was necessary given the nature of the virtualbox devices (nor did it actually work). Clearing out all of these rules for a blank iptables set does not resolve the issue. (you can see ferm generated iptables at http://codedumper.com/ojaze) Thanks for any help you can give... Patrick

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• One user sometimes gets an unknown certificate error opening Outlook

  - by Chris

  Let me clarify a little. This isn't an unknown certificate error it's an unknown certificate error in so much as I can't figure out where the certificate comes from. This happens on a Win 7 Enterprise machine connecting to Exchange 2010 with Outlook 2010. The error he gets is that the root is not trusted because it's a self-signed cert. Take a look at this screenshot because even if I had generated this myself I wouldn't have put "SomeOrganizationalUnit" or "SomeCity" or "SomeState", etc. (Red block covers our domain name.) I'm a little concerned this is a symptom of a security breach. Exchange 2010 has three certificates installed but none of them are this certificate. They all have different expiration dates (one is expired) and different meta-data. edit: There are two scenarios that I see the certificate warning and one of them I can reliably repeat. When the user leaves his computer on over night Outlook pops the Security Warning window. I don't know what time this happens. Using Outlook Anywhere if I connect to Exchange externally via a cellular USB modem the Security Warning window will appear every time I close and reopen Outlook. Whether I say Yes or No does not make a difference on whether or not I can connect to Exchange and send/receive email. In other words, I can always connect to Exchange. I've checked my two Exchange servers and my Cisco router for a certificate that matches this one and I can't find it. edit 2: Here is a screenshot of the Security Alert window. (I've been calling it Security Warning... My mistake.) edit 3: I stopped seeing this error several weeks ago but I can't tie it to any single event (because I just sort of realized that warning had stopped showing up) but I think I found the source of the certificate. Last week I found out that the certificate on our website DomainA.com was invalid. I knew that our web admin had installed a valid certificate so when I look into the problem I found out I was being presented with the invalid certificate that this posting is in regards to. The Exchange server's domain is mail.DomainA.com so I can only guess that Outlook was passing this invalid certificate through as it did some kind of check on DomainA.com. This issue is still a mystery because the certificate warning stopped appearing several weeks ago whereas the invalid certificate issue on the website was only fixed last week. It ended up being a problem with the website control panel. The valid certificate was installed but not being served for some reason and instead the self-signed cert was being served.

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• Can you set up a gaming LAN using OpenVPN installed in a VMware guest OS and be playing the game on the host OS?

  - by Coder

  I would like to setup a gaming VPN. Ie. I have some games that work over LAN and would like to play them with people that are not on my LAN. I know I can do this with OpenVPN. My ultimate goal would be to run OpenVPN portably on my host OS and not even need any virtualization. As such i don't want to install it on my host, but i'm fine with running it portably. I'm even fine with temporarily adding registry keys, and then running a .reg file to remove these entries once i'm done. To this effect i have installed OpenVPN on a virtual machine and diffed the registry. I then manually (using a .reg file) added all the keys that seem important on my host OS and copied the installation folder of OpenVPN onto my host machine. Then i try to run openVPN GUI 1.0.3 as a test and it says "Error opening registy for reading (HKLM\SOFTWARE\OpenVPN). OpenVPN is probably not installed". I verified that that key is indeed in the registry with all subkeys and it looks correct. I have tried running the GUI as an administrator and in compatibility mode with no success. I am running Windows 7. If this fails then i would be happy with installing OpenVPN on a virtual machine in VMWare but they key is that i will be running the game installed on my host machine. The first question for this option is if this is even possible. The second is, that I can't get the VM to have internet access if I use bridging but i can if i use NAT. Is it possible to do this game VPN setup with VMWare guest OS running using NAT? Summary of questions: -Is it possible to run openVPN portably and if so what did i miss above? -If it's not possible to run it portably, then can setup a gaming LAN by installing OpenVPN in a guest OS with NAT and how can i do this? -If the above is not possible then can i install OpenVPN in a guest using bridging and if so how can i set this up with a Windows 7 host and Windows XP guest as currently i can't get the guest to be able to access the internet in bridging mode, but it working in NAT mode. -In general is there any good documentation on setting up a gaming LAN with OpenVPN (i am using 2.1.4) as i have never set up a VPN of any sort before so any help would be much appreciated. Thanks!

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• Single line diff

  - by Ollie Saunders

  Is there a diff tool I can run from the command line or maybe just an online webpage that will compare single lines? GitHub diffs do this but I'm don't want to publish things to GitHub just to read the diffs! This is the sort of thing I'm wanting to diff: a:2:{i:0;O:10:"FuTreeNode":6:{s:5:"outer";r:2;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:2;s:5:"items";a:0:{}}s:5:"value";s:3:"foo";s:4:"next";O:10:"FuTreeNode":6:{s:5:"outer";r:2;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:8;s:5:"items";a:0:{}}s:5:"value";s:3:"bar";s:4:"next";N;s:4:"prev";O:10:"FuTreeNode":6:{s:5:"outer";N;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:15;s:5:"items";a:0:{}}s:5:"value";s:3:"zim";s:4:"next";r:8;s:4:"prev";O:10:"FuTreeNode":6:{s:5:"outer";N;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:22;s:5:"items";a:0:{}}s:5:"value";s:3:"foo";s:4:"next";r:15;s:4:"prev";r:8;s:6:"ofList";O:12:"FuLinkedList":1:{s:5:"items";a:4:{i:0;r:2;i:1;r:8;i:2;r:22;i:3;r:15;}}}s:6:"ofList";r:30;}s:6:"ofList";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:2;s:5:"items";a:2:{i:0;r:2;i:1;r:8;}}}s:4:"prev";N;s:6:"ofList";r:37;}i:1;r:8;} a:2:{i:0;O:10:"FuTreeNode":6:{s:5:"outer";r:2;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:2;s:5:"items";a:0:{}}s:5:"value";s:3:"foo";s:4:"next";O:10:"FuTreeNode":6:{s:5:"outer";r:2;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:8;s:5:"items";a:0:{}}s:5:"value";s:3:"bar";s:4:"next";N;s:4:"prev";O:10:"FuTreeNode":6:{s:5:"outer";N;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:15;s:5:"items";a:0:{}}s:5:"value";s:3:"zim";s:4:"next";r:8;s:4:"prev";O:10:"FuTreeNode":6:{s:5:"outer";N;s:6:"inners";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:22;s:5:"items";a:0:{}}s:5:"value";s:3:"foo";s:4:"next";r:15;s:4:"prev";r:8;s:6:"ofList";O:12:"FuLinkedList":1:{s:5:"items";a:4:{i:0;r:2;i:1;r:8;i:2;r:22;i:3;r:15;}}}s:6:"ofList";r:30;}s:6:"ofList";O:20:"FuLinkedTreeNodeList":2:{s:5:"outer";r:2;s:5:"items";a:2:{i:0;r:2;i:1;r:8;}}}s:4:"prev";N;s:6:"ofList";r:37;}i:1;r:22;} I'm on Mac OS X.

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• Triple (3) Monitors under Linux

  - by widgisoft

  I have a 3 monitor setup (each 1680x1050) via an Nvidia NVS440 (2 GPUs, 2 outputs per GPU totalling 4 outputs); this works fine under Windows XP,7 but caused considerable headaches under Linux (Ubuntu 9.04). I had previously used an XFX 9600GT and the onboard XFX 9300GS to produce the same result but the card was noisy and power hungry and I was hoping that there was some magical switch in the NVS4400 that got rid of this annoying problem - turns out the NVS440 is just 2 cards on one physical PCB :-p (I searched the net high and low for people using this card under Linux but found nothing, if anything the card uses less power and is fan less so I was to benefit from it either way) Anyway, using either set up there were 5 solutions available: Have 3 separate X instances, all un joined Have 3 separate X instances, adjoined by Xinerama Have 2 separate X instances - One using twin-view, both adjoined by Xinerama Have 2 separate X instances - One using twin-view but no Xinerama Have a single Twin-view setup and leave the 3rd screen unplugged :-p The 4rd option, using 2 separate X instances and twinview (but no xinerama) was the best balance in terms of performance and usability but caused 2 really annoying issues You couldn't control (without altering the shortcuts) which screen an application opened onto - and once it was opened you couldn't move it to another screen without opening up terminal and forcing it to move Nvidia's overriding or falsifying of Xinerama breaks and the 2 screens joined by Twin view behave like a single huge screen causing popups to open in the middle of both screens and maximising of windows stretches to the width of the first 2 screens Firefox can only run one instance as the same user so having multiple firefox windows requires at least 2 users The second option "feels" like the right option, but OpenGL is basically disabled and playing any sort of game or even running anything graphical causes a huge performance drop and instability - even trying to run a basic emulator for gba or gens just causes the system to fall over. It works just enough to stare at your desktop and do nothing but as soon as you start doing some work - opening windows, dragging things around - running multiple copies of firefox it just really feels slow. The last open, only going dual screen works perfectly and everything performs as required, full GPU acceleration - two logical screen spaces - perfect, just make it work across GPUs like windows! :-p Anyway, I know RandR was supposed to pick up the slack when it would introduced GPU objects of sorts to allow multiple GPUs to be stitched together to create one huge desktop at a much deeper layer than Xinerama. I was wondering if this has now been fixed (I noticed X server 1.7 is out) and whether anyone has got it running successfully? Again, my requirements are: One huge desktop to drag any window across Maximising of windows to each screen (as XP does) Running fullscreen apps on the primary screen and disabling the mouse from moving onto the others or on all 3 stretched Finally as a side note; I am aware of the Matrox triple (and dual) head splitter but even the price they go for on eBay is more than I can afford atm, my argument: I shouldn't have to buy extra hardware to get something to work on Linux when it's something that's existed in the windows world for a long time (can you tell I don't get on with X :-p); If I had the cash I'd have bought the latest version of this box already (the new version finally supports large resolutions as the displays I have 1680x1050 each).

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• Windows 7 & Virtual PC and Internet (gateway) problems on host PC

  - by Mufasa

  I upgraded to Windows 7 on a PC that is a few years old. The CPU was one revision away from having Hyper-V on it. So, I had to install Microsoft Virtual PC 2007 (v6.0.156.0) to run full XP instances instead of the seamless XP virtualization that is advertised so much. That's fine though; the 'older' version is useful since I use it to run different versions of the whole XP/IE stack for testing. (I'm a web developer.) ...And for the one 16-bit application we still use at the office for scheduling. * sigh * The virtual instances work fine, including networking. My issue is that after a reboot or coming out of sleep mode, my host Windows 7 won't connect to the Internet. It will connect to the local network fine. If I disable the "Virtual Machine Network Services" item (I'll call "VMNS" from here on) in the LAN Connection properties box, it starts working. But than the Virtual PC instances lose their network connectivity. If I re-enable VMNS again in the same instance, everything works (Internet on host and in the virtualized instances). But after the next reboot/sleep cycle this starts over. The route table gave me a clue though. When doing a cycle w/ VMNS enabled: IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 On-link 10.0.3.51 20 0.0.0.0 0.0.0.0 10.0.10.10 10.0.3.51 276 ... After VMNS is disabled, the first route goes away. I assume that is for VMNS to intercept virtualized instance's network connections and forward them correctly? Just a guess though. More info: I checked my Firewall settings and Services (because I'm sort of a control nazi and turn off a lot) but couldn't find anything that made sense and if turned on changed anything. So it might be something there I'm missing, but I don't know what. My current hacked solution: So, I figured I'd mess with the routes myself to see if that helped, it did. If I run a route delete 0.0.0.0 on the universal (0.0.0.0) gateway routes, and add back in just the 2nd line with route add 0.0.0.0 mask 0.0.0.0 10.0.10.10--the one that points to my actual gateway (10.0.10.10)--then I don't have to mess with the disable/enable cycle of VMNS, and everything works. Running those two commands is faster then bringing up connection options and disabling and re-enabling VMNS, but I still don't want to have use that hack script every boot either. (Oh, and I also tried messing with hard-coding TCP/IP settings in my network adapter, including setting high metrics, etc., but that didn't help either.) Any suggestions on the right way to fix this?

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• Frequent and weird wifi disconnections

  - by Sidou

  How would you explain, troubleshoot (and solve) the following problem? Wifi ADSL modem router D-link 2640R installed in living room at about 1.8m height. Working fine, synchronising and getting/serving stable internet connection. First situation: -Laptop 01 in other end of the house, let's say in room01 southern to the living room, distant by about 15m. Getting stable signal of good to very good quality. No disconnection. -Laptop 02 in room02 opposite to room01 (5m West) which makes it almost at the same distance and direction from the router located 15m North. Getting stable signal of good to very good quality. No disconnection. Second situation: -Laptop 01 moved to room03 Northern to the living room (actually just 3m behind the wall where the router lies). Getting stable signal of excellent quality. No disconnection. -Laptop 02 still in room02 but now experiences frequent disconnections (actually almost impossible to get the Internet even though the signal level is still very good. Either no Internet with the wifi icon appearing connected to access point or no connection established at all which happens every 2 minutes and that means virtually no Internet at all as I can just get a timeframe of 1 minute or so to load any website or even get to the router's web based control panel. If Laptop 01 is completely shut down or its wifi adapters shut down or even still working but its wifi MAC address forbidden, then Laptop 02 has no problem at all. If Laptop 02 is moved to a nearer location to the router, in the living room for instance, then no connection problem occurs even if Laptop 01 is also connected. And also if we move back Laptop 01 to its original location (room 01), then no problem as well. I'm completely lost and don't know how to address this issue. I tried to change the Wifi channel and even tried the auto channel scan but that didn't solve it. I know that the problem is probably coming from Laptop 01 being in its new location or some sort of interference as the problem occurs only under the described condition but I have no idea how to solve it! I also scanned the neighborhood for wifi jam using InSSIDer, there are few other access points but they don't seem to affect the situation. Any ideas about the steps to follow or tools to use ?

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• High CPU usage - symptoms moving from server to server after bouncing

  - by grt3kl

  First off, I apologize if I didn't include enough information to properly troubleshoot this issue. This sort of thing isn't my specialty, so it is a learning process. If there's something I need to provide, please let me know and I'll be happy to do what I can. The images associated with my question are at the bottom of this post. We are dealing with a clustered environment of four WebLogic 9.2 Java application servers. The cluster utilizes a round-robin load algorithm. Other details include: Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04) BEA JRockit(R) (build R27.4.0-90_CR352234-91983-1.5.0_12-20071115-1605-linux-x86_64, compiled mode) Basically, I started looking at the servers' performance because our customers are seeing lots of lag at various times of the day. Our servers should easily handle the loads they are given, so it's not clear what's going on. Using HP Performance Manager, I generated some graphs that indicate that the CPU usage is completely out of whack. It seems that, at any given point, one or more of the servers has a CPU utilization of over 50%. I know this isn't particularly high, but I would say it is a red flag based on the CPU utilization of the other servers in the WebLogic cluster. Interesting things to note: The high CPU utilization was occurring only on server02 for several weeks. The server crashed (extremely rare; we are not sure if it's related to this) and upon starting it back up, the CPU utilization was normal on all 4 servers. We restarted all 4 managed servers and the application server (on server01) yesterday, on 2/28. As you can see, server03 and server04 picked up the behavior that was seen on server02 before. The CPU utilization is a Java process owned by the application user (appown). The number of transactions is consistent across all servers. It doesn't seem like any one server is actually handling more than another. If anyone has any ideas or can at least point me in the right direction, that would be great. Again, please let me know if there is any additional information I should post. Thanks!

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• git, egit, submodules, and symlinks -- how should shared sub-projects be handled in eclipse?

  - by Autophil

  Here's the situation. I have a few git projects with a directory structure layed out more or less like this: simpleproj app www admin demo lib model orm view model user blah ... storeproj app www about mobile fbapp lib model orm view model user message cart product merchant Each directory in "lib" contains a separate project, either created in-house or forked, all of which use git for source control. So I figured I should make them submodules of my projects, right? Well, we've been moving toward eclipse + egit, because some of our windows guys not used to a CLI need something they can use without being scared of screwing things up. Anyway, the problem is, egit doesn't support submodules. So, my solution has been a rather crude one involving symlinks... lets say my directory structure on my dev box is generally layed out like this: ~/projects/ bigproj .git app lib model (- ~/lib/model/src/) orm (- ~/lib/orm/src/) neatproj .git app lib view (- ~/lib/view/src/) oldproj .git app lib orm (- ~/lib/orm/src/) ~/lib/ model .git src README.md orm .git src COPYING view .git src ...the symlinks link inside of directory with the git repo, so eclipse doesn't get confused, and everything sort of works. On my machine, I can update the libs from anywhere and all projects will be updated (needing to be committed again of course). Each project stores a separate copy of the contents of the symlinked directories within "lib" -- but only when staged from within eclipse. After committing from eclipse and moving back to the CLI, git sees that a bunch of files have been removed and a few symlinks have been created. Of course this is acceptable also, probably more so than keeping a separate history of the libs for each project... but eclipse and CLI git obviously need to be on the same page so tons of files aren't vanishing and reappearing. So this brings me to my question. I'd like to know how to either: get eclipse+egit to see the symlinks as symlinks if git will somehow handle them properly*, or get the CLI git to treat them as non-symlinks. Or, if there's a better way to do this, I'm all ears. Hope this all made sense! :D Note: tried to tag this as git-submodules, but was not allowed :( * should I make them relative or absolute? Either way it's a mess. Also will symlinks will work on windows? i know there's something similar but you need a 3rd party tool to manage them AFAIK, i doubt these would translate well.

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• Logitech Optical Mouse Frozen In Middle of Windows XP Pro Screen

  - by Code Sherpa

  Hi. I have a Logitech Optical Mouse/Keyboard. I have been using them just fine with the system drivers for almost a year now. I recently updated my Kaspersky software and rebooted. Now the mouse is frozen in the middle of my screen. I am not able to login to the Windows XP Pro box that has the frozen mouse (because i can't work the mouse) but am able to remote desktop to this computer. Things I know / have tried: When I boot on the problem computer, I am able to use the keyboard, but not the mouse. I have installed the latest version of Logitech's SetPoint (with the updated drivers) on the problem computer (via remote desktop) and that didn't seem to matter. I bought new batteries for the mouse and that didn't matter. I have tried the mouse/keyboard on another computer and the mouse works just fine there. My suspicion is that the Kaspersky install has overwritten a driver of some sort. Things I have not done (and would appreciate detailed steps if you feel this is the way to go): 1) Uninstalled all the mouse drivers on the machine and reboot. Then, reinstall. Note: When I get to the Device Manager I don't see an option for Human Interface Devices (where the mouse device is). Here are my options: Computer, Disk Drives, DVD/CD-Rom drives, Floppy controllers, IDE ATA/ATAPI, Imaging devices, Network Adapters, Other devices, Ports, Processors, Sound, video, and gaming, System devices, USB controllers. Also, I should point out that Video Controller is the only thing under Other devices and it has a yellow exclamation mark. The same is true for all the items under Universal Serial Bus controllers. I think this means I have to update my BIOS but, since my mouse was working just fine without doing that, I don't think that is my problem. So, how do I get to my Mouse Device? 2) Update my BIOS. Note: As pointed out above, I don't think this matters as my mouse was working just fine under my computer's current BIOS version. Thanks for your help.

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• iTunes and Hulu Playback Choppy and Slow?

  - by Bart Silverstrim

  Specs: Windows XP, latest updates 1.7 ghz Pentium 4 1 gig ram DirectX 9.0c NVIDIA GeForce FX 5200 with 256 meg RAM OpenGL 2.1 The story: Okay, I had an older system laying around that I figured I would try turning into a mini-media system to connect to our TV. I put together a lot of older parts, got it into working order, etc. and hooked it up and voila'...slower, but usable system that displayed to the TV. It could run some things decently. I put in iTunes, it played video okay. Not great, but okay. Played Hulu and since we have a 1Mb download rate, the minimum for their site, there were some choppy moments when watching their shows, but I found that (sadly) changing resolution to 800x600 seemed to help with the issue when running full screen. I downloaded the application called Boxee and installed it. It wouldn't run; apparently the video card in the system supported OpenGL 1.2, and needed at least 1.4. I bought a cheap card, the 5200, with four times the memory in it and support for OpenGL 2.1. Installed, everything seemed fine. iTunes seemed to run fine, the video driver (PNY video card) came with OpenGL 2.1, and Boxee finally ran. I then upgraded to the latest drivers for the video card and ran the DirectX updater from MS. After that, the OpenGL Extension Viewer wouldn't run. It just stayed as an icon in the task bar. Also, any and all videos in iTunes stuttered and went out of sync horribly. Unwatchable. I tried watching Hulu video in Boxee, and it displayed video like it was a series of stills in a very bad powerpoint. Playing straightforward audio-only came through fine, no stutters no hiccups. I tried system restore to roll back updates to pre-directX updates (I thought that seemed to be the time that triggered the weird behavior), no joy. I tried uninstalling and reinstalling the video drivers. I installed updated audio drivers (ensoniq audiopci), nothing helped. I finally wiped the drive last night and tried reinstalling everything and restoring my iTunes content via an import from a backup. Fresh install, no updater on the video card or directx. the problem was still there although I haven't tested Hulu, the iTunes player is still stuttering like crazy if I play video, fine if I play audio. I know the processor isn't high in heft, but with one gig of RAM and the fact that it seemed to do okay before I thought that the problem must be software related. Has anyone else run into this sort of issue and have a solution other than "buy a new computer"? What specs seem to work with video at the low end for you? Right now the system is of little use other than keeping my music library and iTunes apps synced with my iPod.

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• How to allow unprivileged apache/PHP to do a root task (CentOS)

  - by Chris

  I am setting up a sort of personal dropbox for our customers on a CentOS 6.3 machine. The server will be accessible thru SFTP and a proprietary http service base on PHP. This machine will be in our DMZ so it has to be secure. Because of this I have apache running as an unprivileged user, hardened the security on apache, the OS, PHP, applied a lot of filtering in iptables and applied some restrictive TCP Wrappers. Now you might have suspected this one was coming, SELinux is also set to enforcing. I'm setting up PAM to use MySQL so my users in the web application can login. These users will all be in a group that can use SSH only for SFTP and users will be chrooted to their own 'home' folder. To allow this SELinux wants the folders to have the user_home_t tag. Also the parent directory needs to be writable by root only. If these restrictions are not met SELinux will kill the SSH pipe immediately. The files that need to be accessible thru both http and SFTP so I have made a SELinux module to allow Apache to search/attr/read/write etc. to directories with the user_home_dir_t tag. As sftp users are stored in MySQL I want to setup their home dirs upon user creation. This is a problem since Apache has no write access to the /home dir, it's only writable by root since it's required to keep SELinux and OpenSSH happy. Basically I need to let Apache do only a few tasks as root and only within /home. So I need to somehow elevate the privileges temporarily or let root do these tasks for apache instead. What I need to have apache do with root privileges is the following. mkdir /home/userdir/ mkdir /home/userdir/userdir chmod -R 0755 /home/userdir umask 011 /home/userdir/userdir chcon -R -t user_home_t /home/userdir chown -R user:sftp_admin /home/userdir/userdir chmod 2770 /home/userdir/userdir This would create a home for the user, now I have an idea that might work, cron. That would mean the server needs to check for users that have no home every minute, then when creating users the interface would freeze for an average of 30 seconds before the account creation can be confirmed which I do not prefer. Does anybody know if something can be done with sudoers? Or any other idea's are welcome... Thanks for your time!

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• Have a server, need to figure out a method of backup

  - by PolishHurricane

  My company has an older Dell 2650 server running ArchLinux x64: http://www.dell.com/downloads/global/products/pedge/en/2650_specs.pdf (2 x 2.4GHz Intel Xeon w/around 3287 RAM according to "free -m") We use it to host our internal company site and to post some information from our orders to and we'd like the ability to keep it up as much as possible. What we require: - It needs to always be functional from 8am to 4pm for our data entry person to use it and others to do other things required on it. - If it goes down, we need a quick way to get the machine running again. - If it goes down, we would like to have the data backed up. Some of the major problems include: - The servers old and it may have memory issues - We don't know when one of the hard drives could fail - Our power goes out here once in a while We have a battery backup, but that's pretty much it and it's not for long term. If the server does go down, we have another system in place to store order information that comes in while it's down and repost it when it's back, but we need it up during the day. So we're wondering, what should we get for options? These are the things we thought of, sort of: Setup RAID 1, but that would involve wiping everything right? If we do that, how would we transfer the data over without messing up the server? We could buy an extra server or 2 off eBay for $100, the same model, is that practical or should we get something else? Should we buy a PC or another better server and host off that because it is if anything easier to exchange parts? Should we keep extra parts handy incase it implodes? Should we buy/use backup software? We hear drobo's are cool, but suck. Perhaps there is a software solution to this problem that backs up to another machine or gets us up and running again quickly. Also, if we are to purchase hardware, what is decent? Does anybody know of one for ArchLinux/Linux? We both know a ton about computers but we're kind of unsure what step to take with this, especially with this type of server. Thanks

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• Two DHCP Servers, Block Clients for one of them?

  - by Rilindo

  I am building out a kickstart network that resides on a different VLAN uses its own DHCP server. For some reason, my kickstart clients kept getting assign IPs from my primary DHCP server. The way I have it set up is that I have a primary DHCP server on this router here: 192.168.15.1 Connected to that DHCP server is a switch with the IP of 192.168.15.2. My kickstart (Scientific Linux) server is connected to that switch on two ports: Port 2 - where the kickstart server communicates to the rest of the production network via eth0. The IP assigned to the server on that interface is 192.168.15.100 (on eth0). The details are: Interface: eth0 IP: 192.168.15.100 Netmask: 255.255.255.0 Gateway: 192.168.15.1 Port 7 - has it's own VLAN ID (along with port 8). The kickstart server is connected to that port with the IP of 172.16.15.100 (on eth1). Again, the details are: Interface: eth1 IP: 172.16.15.100 Netmask: 255.255.255.0 Gateway: none The kickstart server runs its own DHCP server and assigns them over the eth1. Most of the kick starts are built over the kickstart VLAN through port 8. To prevent the kickstart DHCP server from assigning addresses over the production network, I have the route setup like so: route add -host 255.255.255.255 dev eth1 At this point, the clients kept getting assign IPs from the 192.168.15.1 DHCP server. I need to figure out a way to block client requests from reaching that DHCP. Its should be noted that but I also build KVM hosts on the kickstart server as well, so I need those KVMs to have the ability to get DHCP requests from the 192.168.15.1 DHCP server via the bridge network once I finish resolved this particular problem. (Currently, they communicate via NAT). So what would be done to resolve this? Through iptables or some sort of routing I need to put in? I tried to limited to requests via IPtables on that interface, allowing DHCP requests for 172.16.15.x network: -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 69 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 69 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 68 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 68 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 67 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 67 -j ACCEPT And rejects assignments on eth1 from 192.168.15.x network: -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 69 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 69 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 68 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 68 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 67 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 67 -j REJECT Nope. :(

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• I can't delete a directory inside a junctioned directory

  - by Fredy Muñoz

  So this is the deal. A couple of days ago I moved my profile folder C:\Documents and Settings\fmunoz to a different drive D:\fmunoz. Today, I created a directory in my desktop using the point-and-click method: Right-click on an empty space in the desktop Select New Select Folder Leave the default name New Folder and press Enter I tried to delete the folder using the point-and-click method: Right-click the New Folder directory Select Delete After five seconds, I got the following message: --------------------------- Error Deleting File or Folder --------------------------- Cannot delete New Folder: Access is denied. Make sure the disk is not full or write-protected and that the file is not currently in use. --------------------------- Initially I thought that there must be some sort of indexing services locking the directory so I got a list of open files using the TuneUp Process Manager tool but the New Folder directory wasn't there. I double-clicked My Computer, navigated to the desktop directory C:\Documents and Settings\fmunoz\Destkop, tried to delete the New Folder directory using the same point-and-click method described above and got exactly the same message at the same amount of time. In the same window, I navigated to the actual location of the desktop directory D:\fmunoz\Desktop, tried to delete the New Folder directory and this time it worked. I thought that this behavior was due to some special treatment that Windows gives to the desktop or the profile directories so I tried doing the same thing with a different set of directories: Created a folder D:\dummy Created a junction C:\dummy pointing to D:\dummy Created a New Folder directory in C:\dummy Tried to delete New Folder from C:\dummy. Didn't work. Tried to delete New Folder from D:\dummy. It worked. I tried creating the folder in the actual directory rather than the junction directory: Created a New Folder directory in D:\dummy Tried to delete New Folder from C:\dummy. Didn't work. Tried to delete New Folder from D:\dummy. It worked. I also tried using the Delete button instead of using the Delete option of the context menu but it didn't work. When using the Shift+Delete sequence, it works. It also works by using the rd command in the console, but in both cases the deleted directory doesn't goes to the Recycle Bin, which is my intention when using the Delete context menu option or the Delete button.

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• How should we serve files in a small bioinformatics cluster?

  - by cespinoza

  We have a small cluster of six ubuntu servers. We run bioinformatics analyses on these clusters. Each analysis takes about 24 hours to complete, each core i7 server can handle 2 at a time, takes as input about 5GB data and outputs about 10-25GB of data. We run dozens of these a week. The software is a hodgepodge of custom perl scripts and 3rd party sequence alignment software written in C/C++. Currently, files are served from two of the compute nodes (yes, we're using compute nodes as file servers)-- each node has 5 1TB sata drives mounted separately (no raid) and is pooled via glusterfs 2.0.1. They each have as 3 bonded intel ethernet pci gigabit ethernet cards, attached to a d-link DGS-1224T switch ($300 24 port consumer-level). We are not currently using jumbo frames (not sure why, actually). The two file-serving compute nodes are then mirrored via glusterfs. Each of the four other nodes mounts the files via glusterfs. The files are all large (4gb+), and are stored as bare files (no database/etc) if that matters. As you can imagine, this is a bit of a mess that grew organically without forethought and we want to improve it now that we're running out of space. Our analyses are I/O intensive and it is a bottle neck-- we're only getting 140mB/sec between the two fileservers, maybe 50mb/sec from the clients (which only have single NICs). We have a flexible budget which I can probably get up $5k or so. How should we spend our budget? We need at least 10TB of storage fast enough to serve all nodes. How fast/big does the cpu/memory of such a file server have to be? Should we use NFS, ATA over Ethernet, iSCSI, Glusterfs, or something else? Should we buy two or more servers and create some sort of storage cluster, or is 1 server enough for such a small number of nodes? Should we invest in faster NICs (say, PCI-express cards with multiple connectors)? The switch? Should we use raid, if so, hardware or software? and which raid (5, 6, 10, etc)? Any ideas appreciated. We're biologists, not IT gurus.

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• Network speeds being report as 4x higher than actual in Windows 7 SP1

  - by Synetech

  Ever since installing Windows 7 SP1, I have noticed that all programs that display my network transfer rate have been exactly 4x higher than they actually are. For example, when I download something from a high-bandwidth web site or through torrents with lots of sources, the download rate indicated is is ~5MBps (~40Mbps) even though my Internet connection has a maximum of only 1.5MBps (12Mbps). It is the same situation with the upstream bandwidth: the connection maximum is 64KBps, but I’m seeing up to 256KBps. I have tried several different programs for monitoring bandwidth throughput and they all give the same results. I also tried different times and different days, and they always show the rate as being four times too high. My initial thought was that my ISP had increased the speeds (without my noticing), which they have done before. However, I checked my ISP’s site and they have not increased the speeds. Moreover, when I look at the speeds in the program actually doing the transfer (eg Chrome, µTorrent, etc.), the numbers are in line with the expected values at the same time that bandwidth monitoring programs are showing the high numbers. The only significant change (and pretty much the only change at all) that has occurred to my system since the change was the installation of SP1 for Windows 7. As such, it is my belief that some sort of change exists in SP1 whereby software that accesses the bandwidth via a specific API receives (erroneously?) high numbers while others that have access to the raw data continue to receive the correct values. I booted into Windows XP and downloaded some things via HTTP and torrent and in both cases, the numbers were as expected (like they were in Windows 7 before installing SP1). I then booted back into 7SP1 and once again, the numbers were four times higher than possible. Therefore it is definitely something in SP1 that has changed how local bandwidth is calculated/returned. There is definitely something wonky with Windows 7 SP1’s network speed calculation. I tried Googling this, but (for multiple reasons), have had a difficult time finding anything relevant. Has anybody else noticed this behavior? Does anybody know of any bugs or changes in SP1 that could account for it?

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