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• Horrible performing RAID

  - by Philip

  I have a small GlusterFS Cluster with two storage servers providing a replicated volume. Each server has 2 SAS disks for the OS and logs and 22 SATA disks for the actual data striped together as a RAID10 using MegaRAID SAS 9280-4i4e with this configuration: http://pastebin.com/2xj4401J Connected to this cluster are a few other servers with the native client running nginx to serve files stored on it in the order of 3-10MB. Right now a storage server has a outgoing bandwith of 300Mbit/s and the busy rate of the raid array is at 30-40%. There are also strange side-effects: Sometimes the io-latency skyrockets and there is no access possible on the raid for 10 seconds. The file system used is xfs and it has been tuned to match the raid stripe size. Does anyone have an idea what could be the reason for such a bad performing array? 22 Disks in a RAID10 should deliver way more throughput.

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• How to install Oracle's exp / imp binaries

  - by Sotapanna

  I was browsing the net to find a solution, but I had no luck. :( How can I install Oracle's imp / exp binaries to my CentOS box without installing an Oracle Server? I'm accessing an existing Oracle database on another machine, so I only need a client here. I already installed sqlplus and its dependencies (oracle-instantclient11.2-basic-11.2.0.3.0-1.x86_64.rpm, and oracle-instantclient11.2-odbc-11.2.0.3.0-1.x86_64.rpm), but that didn't provide those tools. Do I really need to fully install Oracle? My aim is to suck a database dump from the Oracle to my CentOS box. If there is another way to do this without using exp I wouldn't feel bad about NOT using it, but it seems to me there is no alternative.

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• How to format HDD with MHDD Tool.

  - by PP

  I have copied MHDD application on a bootable CD and i wan to use it to low level format my HDD which had some bad sectors on it. so how can mark these badsecotrs using MHDD application? Pluse can i partition/format my HDD using MHDD because after low level format i want to setup window xp on that drive. can some one explain me step by step procedure to how to lovel format driven and partition/format it and then setup xp on that. Link to MHDD app. http://hddguru.com/content/en/software/2005.10.02-MHDD/ Thanks, PP.

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• Prevent Server Restart after Windows Updates

  - by eidylon

  we have a number of servers in our office, as a small hosting company, and these servers are critical to business, ... web server, mail server, db server, etc. On a semi-regular basis, when the machines get automatic updates, they just automagically reboot themselves in the middle of the night. A number of them have software which must be running on the console session (bad practice, I know, but out of my control). When they reboot themselves, these programs obviously shut down, leaving customers upset and services interrupted. How do you set a Windows Server 2003 R2 machine to NEVER automagically reboot itself after updates? And perhaps, if possible, to instead email someone so that they are aware it needs a pending reboot and can schedule it for the best time? Thanks in advance!

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• What could cause Vista machines to degrade in performance?

  - by gencha

  We have installed several machines running Windows Vista at a client site. These machines run the same set of applications each day and are not operated with by any user. They mainly run a 3D application for digital signage purposes. After a few months I noticed that several machines suffer from really bad stuttering. The performance is unacceptable. At first I figured it was faulty hardware. But after putting a fresh image on them, they run perfectly fine again. These are Core i7 machines with GTX 280 graphics adapters. They should be able to handle the workload without any trouble (and they do, at least for a while). I really have no idea how to track down the source of this issue. Especially since not all of the machines display the same issue.

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• Blacklisting: IP's or domains?

  - by johnnietheblack

  I am implementing a blacklisting system on my website that monitors contact forms for suspicious usage (both spam content and excessive frequency). When I find somebody / robot that meets my criteria for blacklisting, I want to send them to my DB as a blacklisted entity. My question is, should I blacklist them as an IP or as a domain? As far as I can see, blacklisting an IP is going to be far more effective, because I allow people to enter their email address in the form, and they can easily just change their domain on a regular basis. However, the downside is that if I blacklist an IP, I could potentially be blacklisting a large group of people who share an IP, when only one person is bad (ie - college campuses, coffee shops, etc). Is there a solution I'm missing?

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• Migrated from Exchange 2003 to Exchange 2007 - remove old 03 computer account?

  - by TheCleaner

  Migrated from Exchange 2003 to 2007 back in February of this year. I've still got the old exchange computer account in AD. Can I simply delete the computer account or will bad things start happening? I've looked in the Exchange 07 console and don't see the old server listed at all. HOWEVER: we do still have an old CNAME for this old Exchange server pointing to the new one for a few old clients that still have their mail server set to the old name...if that matters at all. I ran "get-exchangeserver" on the new server and the old one isn't listed at all.

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• How do you test if a PCI slot is working - motherboard diagnostic software?

  - by Adam

  I suspect that my motherboard is bad, and that my PCI-E slot is not working. I have a Gigabyte motherboard that had a Hauppage 2250 working fine in the PCI-E slot for many months. However - recently - would not get TV channels that I used to get --- until finally Media center cant detect any channels at all. Got a new tuner card (ATI 350 card) - cant detect any channels. The cable signal is good - I have it connected directly to a TV - all channels come in clear. SO that is why I suspect a motherboard problem. Are there any motherboard diagnostic scanner utilities that can verify I need a new motherboard

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• Memcached failover

  - by user25164

  We have 2 memcached servers configured and use the Eniym client. When one of the server is down, it appears this server is added to the deadServers list (ServerPool.cs) and tries to resurrect the server every 10seconds (we have configured deadTimeOut to be 10seconds). Attempting to connect to the failed server causes a TCP timeout, the pages take a long time to load which results in bad user experience. 1) What is the standard way of resolving this issue? There are some posts about removing the server from the deadServers list. Is it okay to do this? 2) What is the recommended deadTimeOut setting (I understand by default it's 2 mins and we've changed it to 10seconds in our implementation) 3) Am I correct in my understanding that the cached data is not replicated across Server 1 and Server 2? If Server 1 is down, then it goes to the database to fetch these values (and it doesn't really check Server2)? Any help is really appreciated.

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• Does sending e-mail in the name of customers increase the risk of being marked as spammer?

  - by Adrian Grigore

  Hi, We are developing a SaaS website application that lets users send invoices to their clients. Ideally, these e-mails should appear to be originating from our customers, so the sender e-mail address domain will not match the reverse IP entry for our server. In effect we would be forging their e-mail address, but of course with their consent. Will that result in a higher probability of being marked as a spammer / their e-mails being marked as spam? If yes, how bad is the penalty? And what about people who have an e-mail address originating form an SPF-enabled domain? I guess it should be the majority of the big e-mail providers.

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• Would a Socket Connection Outperform an Intarvaled Database Sweep and Requests?

  - by Jascha

  I'm building a small chat application to add to an existing framework. There will only be 20-50 users MAX at any one time. I was wondering if I could get away with updating a cache file containing (semi) live chat data for whichever users happen to be chatting just by performing timed queries and regular AJAX refreshes for new data as opposed to learning how to open and maintain a socket connection. I'm sure there are existing chat plug-ins out there. But I just had a hell of a time installing one and I could see building the whole damn thing taking just as much time as plugging one in. Am I off to a bad start? Thanks in advance -J (p.s. this is a semi closed network behind a php login so security isn't a great concern)

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• Problems installing Ruby 1.9.2 and rvm on Debian Lenny

  - by Dave Everitt

  I have currently have Ruby 1.9.1 (bad) and want to install 1.9.3 under rvm. However, rvm requirements gives a long list: install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion But I've hit a problem here: /# apt-get install libreadline6 Reading package lists... Done Building dependency tree Reading state information... Done E: Couldn't find package libreadline6 ...and (I imagine after just hunting down a Debian source to download curl) finding these packages isn't going to be a picnic. Given that there are few packages to install before I can get rvm to install Ruby 1.9.3, what's a good way forward? My sources.list: deb http://archive.debian.org/debian/ lenny main contrib

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• Cloning hard drive -- data, operating system settings, everything

  - by Salman A

  I am using Windows XP. My hard drive (Seagate 160gig Barracuda) is about to fail. Its already developed bad sectors and it seems to get worse everyday. Data transfer mode is down to PIO mode 2, chkdsk runs every now and then, registry and important windows files get corrupted and I spend 30-60 minutes running chkdsk /f /r from the recovery console. I've got a replacement (Seagate 5000gig Barracuda) and now i want to transfer each and every thing on to the new drive. I don't want to go through windows and software installation, I spent ages getting all those software installed and configured on that hard drive. Need advice: whats the best way to transfer everything onto the new drive so that it behaves just like the old one. And are there any "gotchas".

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• Does anyone use the L-Track trackball?

  - by thethinman

  I've been using the Logitech Trackman Marble Mouse for years. Now I'm looking for a trackball with a scroll wheel, larger and heavier ball, and preferably rollers instead of pins. It must be finger (not thumb) operated. The Kensington Expert Mouse is close, but from what I've read the scroll wheel is poorly implemented. They also switched from rollers to pins. I bought a Kensington Orbit Trackball and it's not bad but the scroll wheel is rough and the ball is the same as the marble mouse. I'm still looking for something better. I found the L-Trac and it looks good but there's little info on the web. Has anyone used it and can provide their impressions? Or can you point out another option?

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• How to move unseen windows => Cannot access my application after switching monitors

  - by Stephane Rolland

  I switch monitors really often: At work I have a very poor computer, and gpu too, which is bad at keeping its configuration, resolution and monitor position between each reboot. Both monitor are different size and resolution. When doing that I often have applications that were on one of the monitors that remember their last position opened... so now they are unseen, at screen coordinates I cannot access. I know there is a shortcut that can access the move functionnality of a window. Could you remind it to me. Do you have other trick to center all opened windows into the visible screens ?

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• Database modularity with EBS volumes

  - by Eclyps19

  I would like to add modularity to my websites on EC2 instances by encapsulating the site files and the mysql files in their own EBS volumes. The end result that I'm going for is the ability to quickly mount a volume or two to different servers running the same AMI (for testing/development/emergency maintenance, etc), as well as maintain separate snapshots of each. I'm able to do this fairly easily with a single database by symlinking my mounted database EBS to the appropriate places (/var/lib/mysql, /etc/my.cnf, /var/log/mysqld.log), but I'm not sure if it would even be possible be possible to have multiple databases on different EBS volumes running concurrently. Example: /website1/www.website.com /database1/ /website2/www.otherwebsite.com /database2/ Could anybody shed some light on this for me? Is it possible? Is it a bad idea? Thanks.

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• Sharing Windows Store apps between accounts

  - by Klas Mellbourn

  In Windows 8 it seems natural to me that each person in a family has their own Microsoft Account with which they log in. If you pay for an app on the Windows Store, you can install that same app on several computers using the same Microsoft Account. Good. However, if several persons, in this case my children, each have their own account on the same computer, they do not get access to apps bought on a sibling's account, even if the app has been installed on the same computer. Bad. (Compare this to iOS where you are allowed have several iPhones with different iCloud-connected accounts but all using the same iTunes App Store account, which is perfect for a family where all can then use the same app which was bought just once) Is there any way to share apps between Microsoft Accounts (e.g. members of the same family)? Alternatively, is there a way to run apps that are installed on a computer when you are logged in with a Microsoft Account different than the one used when installing the app?

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• is it worth defragging an iPod

  - by alimack

  Essentially my 5G iPod was cutting tracks off and generally misbehaving. So I did the following: 1) Use Diskwarrior - heavy directory fragmentation which it fixed; 2) Use iDefrag - some fragmentation but it kept halting as it couldn't move files; 3) Try to write out drive with Disk Utility - got a warning from DU so gave up before I started; 4) Completely restored using iTunes; 5) Reran Diskwarrior - still heavy directory fragmentation; 6) Reran iDefrag, still fragmentation although limited to two bands; The iPod is much quicker to traverse menus and no more track skipping. My question is this - is defragging worth it or does the heat generated by the process kill the drive and make it a self-defeating process. Anyone have any metrics/ figures? Clearly it's a bad idea for solid state drives like the nano & touch.

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• What ports does Advantage Database Server need?

  - by asherber

  I have an application which uses ADS and I am attempting to deploy it in a Windows network environment with a rather restrictive firewall. I am having a problem configuring firewall ports appropriately. ADS lives on \\server, and it's listening on port 1234. When \\client tries to connect to \\server\tables, I get Error 6420 (Discovery process failed). When \client tries to connect to \\server:1234\tables, I get error 6097, bad IP address specified in the connection path. \\server is pingable from \\client, and I can telnet to \server:1234. If I try to connect from a client machine inside the firewall, either connection path works fine. It seems there must be something else I need to open in the firewall. Any ideas? Thanks, Aaron. Edit: I should have specified that the firewall is open to \\server:1234 specifically for TCP traffic. Is UDP involved here in some way?

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• Windows - Delayed Write Failed error on USB hard drive

  - by ndngrd

  I've got a new Verbatim 1.5TB USB hard drive (Samsung HD154UI) and I'm finding myself completely unable to fill it. I'm using Windows XP. Whenever I try to copy a load of files over, it works for some time (will copy over between 20 and 90GB) but eventually stops with an error saying "The specified path is too deep" - the specified is not too deep, there's nothing more than 2 dirs deep that I'm copying. A balloon pops up at the bottom saying "Windows - Delayed Write Failed" telling me the data could not be copied. This wouldn't be too bad if I could just restart the transfer, but after this error has happened I can't write anything else to the disk - including if I eject it and then connect it to another machine. It just seems completely locked. The only way I can unlock it is to delete everything that I was copying to it. I've tried various USB cables and copying from different machines, and the same thing keeps happening.

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• OpenLDAP Password Expiration with pwdReset=TRUE?

  - by jsight

  I have configured the ppolicy overlay for OpenLDAP to enable password policies. These things work: Password lockouts on too many failed attempts Password Change required once pwdReset=TRUE added to user entry Password Expirations If the account is locked out due to intrusion attempts (too many bad passwords) or time (expiration time hit), the account must be reset by an administrator. However, when the administrator sets pwdReset=TRUE in the profile, this seems to also override the expiration policy. So, the password that the administrator sent out (which should be a temporary password) ends up being valid permanently. Is there a way in OpenLDAP to have a password that must be changed, but also MUST expire?

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• Partition error being reported by only some programs

  - by Mahmoud20070

  I am getting an error about the partitions on one of my drives. I checked my hard disk with Acronis Disk Director 11 Home, HDTunePro, MiniTool Partition Wizard, Hddscan, HDD Regenerator 2011, WD Data Lifeguard Diagnostics, GParted, and Parted Magic, but none of them found any problems with the drive. However, when I perform a check with PartitionGuru, DiskGenius, and an old version of Partition Magic (8.0), I get the following error (seen below) about the partition being bad and needing to reformat to fix it: Error - The number of sectors record in DBR overflow - Reformat Should I reforamt or not? I checked two other hard drives, one of them like my 500 WD Blue, and neither has any errors with any progras. Are there any other programs that can check partitions for errors? Finally, how should a large SATA hard disk be formatted? I currently use programs like GParted, Acronis Disk Director, or MiniTool Partition Wizard. Are these programs good for formatting a new hard disk? Could the choice of format tool be the cause of the error?

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• Writing my first bash script (line 2: testscript: No such file or directory)

  - by skyeagle

  I am attempting to write my first shell script (I'm running Ubuntu 10.x) This is what my 'script' looks like cd /path/to/directory/cronscripts . testscript I put the following debug statements (after the cd), in the script above to make sure everything was ok: pwd echo `ls -lhrt` and it displayed all the files in the directory. So I dont understand the error message I am getting. I have the following two questions Why am I getting the above error message and how do I fix it? My script seems to run fine without a shebang in the first line - infact when I try either of the following: #!/usr/bin/bash #!/usr/bin/bash env I get the following error message: /usr/bin/bash: bad interpreter: No such file or directory What is the purpose of the shebang statement and why do I get the above error when I try to include it in my script/ how do I fix it, so I can add the shebang (is it necessary? - it seems most script examples have the shebang - but I'm not sure if it is a must, as the script runs without it).

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• Implementing a form of port knocking + Phone Factor = 2 Factor auth for RDP?

  - by jshin47

  I have been looking into how to secure a publicly-available RDP endpoint and want to implement our two-factor authentication RADIUS server, PhoneFactor. I would like to implement the following process: User opens up web app in browser In web app, user enters username + password, initiates RADIUS auth Phone factor calls user to complete auth Once user is authenticated, port 3389 is opened on user's IP on pfSense firewall. After some amount of time, firewall rule is removed for that IP I would like to know the following: Is this a typical setup? If it is a bad idea, please explain why. If it is possible, are there any packages that assist with this? Specifically, the third step, where the appropriate firewall rule would need to be added... Edit: I am aware of TS Web Gateway, but I want the users to be able to use the traditional RDP client...

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• installing plugins in vim

  - by Ying

  I had a real difficulty installing vim plugins on mac. I know for a plugin to be installed it has to be seen by runtimepath. According to vim docs, this is Macintosh: "$VIM:vimfiles, $VIMRUNTIME, $VIM:vimfiles:after" First off, what does $VIM:vimfiles mean?? It is certainly not $VIM/vimfiles, as (~/.vim/vimfiles) does not work. So my options are 1) put my plugin in /usr/share/vim/vim73 (my $VIMRUNTIME, which i know to be BAD) 2) find a way to make vim look at my home directory when including plugins. I have putting my plugin in: ~/.vim/plugin.vim ~/.vim/vimfiles/plugin.vim ~/.vim/plugin/plugin.vim All to no avail. Can somebody help me out here? Thanks!

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