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• Setting up a home network

  - by Mat Richardson

  I'm trying to get my head around how to do this with the equipment I have. Here's how it is.. I have an old laptop that has server 2003 installed on it. This has no wireless NIC, but I have a spare wireless router that I can wire to it. We have a virgin wireless router which provides the home with internet access. What I would like to do it make resources on the server 2003 machine available to the rest of the devices in the home - specifically a couple of laptops running windows 7. Ideally I'd like to be able to use the laptop as a fileserver but maybe also offer application virtualization. In the first instance however, I'd like to create a file server with the laptop and allow connections to it by the other machines. Virtualisation is just a 'nice to have'... Given the hardware I have is this possible? Can you point me in the right direction how to do what I want if this is the case?

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• Why does my ftp(e)s server fails like half of the time

  - by user1092608

  I have this discussion at work regarding our ftp server running via vsftpd. Initially, we have opted to serve ftpes instead of sftp because this seemed the most flexible and straightforward solution for our server to have secure file transmission. Afterwards, our ftp server seems to be a source of issues for our end users. Half of the time, users complain about not working ftp connections. I must say, i tested our FTP trough different infrastructures (=in the field, at random times at random places) and indeed, sometimes behind some configurations (=no idea how they are configured, because the 'field' testing), i recieve errors. Some of the are: Error: Failed to retrieve directory listing (filezilla) Furthermore, behind my basic home configuration, everything seems to be running fine. I (think I) did all the basic configuration checks (passive mode?, firewall for all ports?, ...) and can't seem to find the source. Being a bunch of techies at our small office, yet knowing nothing about infrastructure, some start suggesting that ftps protocol could be the source of issues. ("No, i only knew sftp so far" "Ftps is not widespread"). I, however, strongly doubt this hypothesis, since reading around on the www, asking questions on serverfault, everyone seems to deny this. So, as I would like to avoid reconfiguring, since this involves messing around in our SSH service, our virtual user setup and ftp service, i would need some advice on 1) what could be potentially the general cause? 2) do you have some general tips? 3) would you mind having a look at my configuration file? ----- General Settings ----- write_enable=YES dirmessage_enable=YES nopriv_user=ftpsecure ftpd_banner="Welcome to XXXX FTP!" hide_ids=YES hide_file=.* max_per_ip=10 max_clients=10 local_enable=YES local_umask=022 chroot_local_user=YES secure_chroot_dir=/usr/share/empty userlist_enable=NO userlist_deny=YES userlist_file=/etc/vsftp_deny_users guest_enable=YES guest_username=ftpvirtual virtual_use_local_privs=YES user_sub_token=$USER local_root=/srv/ftp/ftpvirtual/$USER anonymous_enable=NO syslog_enable=NO xferlog_enable=YES xferlog_file=/var/log/vsftpd_xfer.log connect_from_port_20=YES pam_service_name=vsftpd listen=YES listen_port=21 pasv_enable=YES pasv_min_port=30000 pasv_max_port=30030 pasv_address=foo ssl_enable=YES rsa_cert_file=/etc/vsftpd.pem rsa_private_key_file=/etc/vsftpd.pem force_local_data_ssl=YES force_local_logins_ssl=YES ssl_tlsv1=YES ssl_sslv2=YES ssl_sslv3=YES ssl_ciphers=HIGH anon_mkdir_write_enable=NO anon_root=/srv/ftp anon_upload_enable=NO idle_session_timeout=900 log_ftp_protocol=NO dsa_cert_file=/etc/vsftpd.pem Thanks

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• File descriptor linked to socket or pipe in proc

  - by primero

  i have a question regarding the file descriptors and their linkage in the proc file system. I've observed that if i list the file descriptors of a certain process from proc ls -la /proc/1234/fd i get the following output: lr-x------ 1 root root 64 Sep 13 07:12 0 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 1 -> /dev/null l-wx------ 1 root root 64 Sep 13 07:12 2 -> /dev/null lr-x------ 1 root root 64 Sep 13 07:12 3 -> pipe:[2744159739] l-wx------ 1 root root 64 Sep 13 07:12 4 -> pipe:[2744159739] lrwx------ 1 root root 64 Sep 13 07:12 5 -> socket:[2744160313] lrwx------ 1 root root 64 Sep 13 07:12 6 -> /var/lib/log/some.log I get the meaning of a file descriptor and i understand from my example the file descriptors 0 1 2 and 6, they are tied to physical resources on my computer, and also i guess 5 is connected to some resource on the network(because of the socket), but what i don't understand is the meaning of the numbers in the brackets. Do the point to some property of the resource? Also why are some of the links broken? And lastly as long as I asked a question already :) what is pipe?

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• Good Hosting Providers With Zend Framework Support [closed]

  - by manyxcxi

  I currently use ixwebhosting for my hosting services. They're cheap and work (most of the time). The databases are horribly slow, the servers are horribly slow, and their support (though usually prompt) is tough to deal with. That being said, they're cheap, I've got like 20 domains hosted in my account, none of them are high volume, and they work JUST good enough- until today. This isn't meant to be a condemnation of ixwh though. Their prices are very low for what they do offer and most things work just fine, most of the time. I need to be able to host web apps written with Zend Framework in a fairly easy fashion. The server performance can't be worse than what I've already had (a pretty low hurdle to clear), and I don't want to spend $30/mo. These are not money making websites- they're projects. My requirements are PHP 5.3, ZF support, MySQL databases, multiple domains- not much. Who should I look at, and who should I look out for?

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• Relinking a deleted file

  - by mbac32768

  Sometimes people delete files they shouldn't, a long-running process still has the file open, and recovering the data by catting /proc/<pid>/fd/N just isn't awesome enough. Awesome enough would be if you could "undo" the delete by running some magic option to ln that would let you re-link to the inode number (recovered through lsof). I can't find any Linux tools to do this, least with cursory Googling. What do you got, serverfault? EDIT1: The reason catting the file from /proc/<pid>/fd/N isn't awesome enough is because the process which still has the file open is still writing to it. A delete removes the reference to the inode from the filesystem namespace. What I want is a way of re-creating the reference. EDIT2: 'debugfs ln' works but the risk is too high since it frobs raw filesystem data. The recovered file is also crazy inconsistent. The link count is zero and I can't add links to it. I'm worse off this way since I can just use /proc/<pid>/fd/N to access the data without corrupting my fs.

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• SQL Server Replication Backup

  - by user18039

  Hi We have a new system that runs on SQL Server 2008 r2 64-bit. There is a primary on-line transactional processing (OLTP) database that accepts a high volume of updates from several thousand Point of Sale systems at stores around the country. In order to protect this vital function, I have decided to introduce a dedicated reporting database server - from which multiple users will run some pretty complex reports. I realise that there were a number of choices but I decided to use Transaction Replication as the mechanism for copying the data from the OLTP database to the new reporting database - one way replication. The solution has worked well in test. I'm now being asked what changes need to be made to the backup policy to cover the architectural changes. I have read pages such as MSDN:Strategies for Backing Up and Restoring Snapshot and Transactional Replication but I think these are overkill for my solution. In fact, my current thinking is that we simply need to continue making backups of the OLTP data and logs. If the Reporting db or any of the system replication (eg distribution) databases fail then it's no big deal - we can clear all down then re-create the replication. I realise that taking a complete snapshot of the OLTP would be time consuming (approx 5 hours) but I'd be more relaxed about this that trying to restore backups of the various data and log files in the correct sequence. My view is that the complex strategies set out in the MSDN article would only be the way to go for a more complex replication solution than I have, eg if there were multiple subscribers with 2-way replication. Would you agree? I'd be grateful for any advice. Many thanks, Rob.,

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• Outbound ports to allow through firewall

  - by dunxd

  This question was asked before, but in a rather general way. I'm asking more specifically based on my current requirements. We have a number of remote offices made up of a bunch of PCs and an ASA 5505 which is used as firewall and VPN termination point. In the offices we share the internet connection with one or more other organisations over whom we have very little control, asides from the config on the ASAs. For a bunch of reasons I'd like to lock down these ASA 5505s to only allow outbound traffic to ports used by applications we know we need. I'm putting a standard config to roll out to all the ASAs, and if we need to open up ports for the other orgs we can do it on request. But I want to leave open the most commonly required ports so we can get up and running without waiting on other folks technical staff to get back. I plan to allow the following TCP ports to support commonly required resources: POP3 (110 and 995) HTTP (80 and 443) IMAP4 (143 and 993) SMTP (25 and and 465) The question really is, what other ports do I need to leave open to allow for "normal" working. I've seen UDP port 53 for DNS as one. Are there any others that would be worth opening up? Just to note - I'll also be setting up monitoring systems to keep an eye on the ports we do allow. Any of the above could be misused of course. We'll also back all this up with signed agreements. But I'm aiming for a technical solutions where I don't have to start out with the full requirements of everyone we share connections with. See also: outbound ports that are always open

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• Why Are SPF Records Failing?

  - by robobobobo

  Ok I've been going through various different sites, resources and topics here trying to figure out what is wrong with my SPF records but no matter what I do they don't seem to pass. Here's what I have "v=spf1 +a +mx +ip4:217.78.0.92 +ip4:217.78.0.95 -all" I've tried multiple different tools to check my spf records, some give me a pass, some don't. But I can't send mail to certain google app accounts, they just bounce back all the time which is very annoying. Anyone got any ideas? I have noticed that the source IP address is not the IPV4 addresses I've defined, but Cpanel wouldn't let me add that address into it.. And here's the result of tests I'm getting back from port25.com. I'm running WHM by the way and have enabled spf and dkim. Summary of Results SPF check: fail DomainKeys check: neutral DKIM check: pass Sender-ID check: fail SpamAssassin check: ham Details: HELO hostname: server1.viralbamboo.com Source IP: 2a01:258:f000:6:216:3eff:fe87:9379 mail-from: ###@viralbamboo.com SPF check details: Result: fail (not permitted) ID(s) verified: smtp.mailfrom=###@viralbamboo.com DNS record(s): viralbamboo.com. SPF (no records) viralbamboo.com. 13180 IN TXT "v=spf1 +a +mx +ip4:217.78.0.92 +ip4:217.78.0.95 -all" viralbamboo.com. AAAA (no records) viralbamboo.com. 13180 IN MX 0 viralbamboo.com. viralbamboo.com. AAAA (no records) DomainKeys check details: Result: neutral (message not signed) ID(s) verified: header.From=###@viralbamboo.com DNS record(s): DKIM check details: Result: pass (matches From: ###@viralbamboo.com). ID(s) verified: header.d=viralbamboo.com Canonicalized Headers: content-type:multipart/alternative;'20'boundary="4783D1BE-5685-41CF-B91B-1F15E91DD1E3"'0D''0A' date:Mon,'20'1'20'Jul'20'2013'20'21:30:47'20'+0000'0D''0A' subject:=?utf-8?Q?test?='0D''0A' to:"[email protected]?="'20''0D''0A' from:=?utf-8?Q?Rob_Boland_-_Viralbamboo?='20'<###@viralbamboo.com'0D''0A' mime-version:1.0'0D''0A' dkim-signature:v=1;'20'a=rsa-sha256;'20'q=dns/txt;'20'c=relaxed/relaxed;'20'd=viralbamboo.com;'20's=default;'20'h=Content-Type:Date:Subject:To:From:MIME-Version;'20'bh=CJMO7HYeyNVGvxttf/JspIMoLUiWNE6nlQUg5WjTGZQ=;'20'b=;

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• Setting up a global MySQL Cluster in the cloud

  - by GregB

  I'm giving the question an overhaul to more specifically identify where I need help. I use two tools to manage a bunch of cloud server: Puppet and Rundeck. Both of these can be configured to use a mysql backend. I'd like to setup an instance of each application in both the U.S., and the U.K., treating the U.K. servers as hot stand-bys in case of failure in the U.S. I want to use a MySql cluster so that the data is automatically replicated from the U.S. to the U.K. Because these are hot standbys, high performance is not a goal. Redundancy and data integrity are most important. My question revolves around the setup of the mysql cluster. I want to run three servers, each one running a data node, a sql node, and a management node. Is this a valid configuration for mysql server? If so, could someone point me in the right direction for creating such a setup? I've downloaded the offical tarball, and the official debian, and the documentation for them contradicts many of the online tutorials. I'm installing on Ubuntu 10.04.

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• Internet compression proxy for low speed broadband?

  - by user23150

  I live in a rural location, using high-latency wireless off a local ISP's tower. My speed tests vary day to day, but I can get around 1Mb up/down. The problem is, I work with large files, uploading and downloading (HD videos, development software, etc.). It can be painful to wait sometimes. Plus I do some side contract game development, and it can be very difficult to playtest with other developers (200ms ping is a good day for me). Now, obviously it's not going to be easy to solve the latency problem without different wireless hardware. But speedwise, I am wondering if I can use some kind of compression technology on a proxy. For instance, my work computer has full access to a 26Mb down, 10Mb up connection, that is totally unused at night and the weekends. If I could run some kind of compression technology on our server, and use it as a proxy to route to my home computer, I could stand to gain some major speed. I realize that by bogging down a system with compression, I could potentially lose whatever speed gain I had. But the proxy server is a quad core xeon, and the receiving computer is a pretty decent i7 computer, so that shouldn't be a concern. I found http://toonel.net/ but it seems more geared toward very slow narrowband users, like dial-up. Plus, I would prefer to just be able to point my browser to a proxy server, rather then install software on my client machine. EDIT I thought about my question a little more, and realize I am going to need to install software on my client in order to decompress, and possible compress (for uploading). That's not a huge deal.

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• Router as primary DNS server, Server as alternate? (or vice versa)

  - by Jakobud

  We have a very small business network, with a typical cable modem hooked into a DD-WRT router. We also run a basic CentOS server that does a variety of things, including acting as the primary DNS server for the office. The reason we need an internal DNS server is because we do a lot of internal web development and use the DNS server to add/remove various local network URLs for internal website testing (like www.testsite.com.local). It's very important for us to be able to add/remove URL aliases easily to the DNS. The problem with this setup is that if we ever need to restart the CentOS server or take it offline for upgrades or whatever, then internet access for all computers on the network is lost. That's because each computer relies on that DNS server to access the Internet I guess? The router is online all the time and very very rarely has to be restarted. It would be nice if we could setup my router to be the primary DNS server but still be running DNS on my server. So we could still add my local testing website URLs to the DNS server in CentOS, but be able to also take down the CentOS server without loosing Internet access on the network. How would this be setup? Would I simply need to add both router + server IP addresses to each computer's IP settings? Is the router primary DNS and server secondary DNS server? Or vice versa? Or can one of the two serve as a fallback for the other? What (if anything) needs to be configured on both the router and server in order for them to recognize that the other DNS server exists on the network? Does anyone have any newb-friendly resources for setting up something like this?

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• pgpool2+streaming replication failover on only 2 servers?

  - by aneez

  I am trying to configure pgpool2 and postgresql 9.1 to handle failover. I currently have streaming replication running, and are using pgpool2 for read-only load balancing. I have 2 servers in my setup, both running postgresql - 1 master and 1 slave. The master is also running pgpool2. My question is how do I configure this setup to handle failover? Specifically in the case that the master crashes, and the slave has to take over and run pgpool2 as well. Most documentation and examples I have been able to find assumes that pgpool2 is running on a separate server and thus "never" crashes. I may or may not be attacking the problem using the wrong tools. In my production setup I have a total of 3 identical servers all in independent locations. The main goal of the setup is to achieve a high uptime. Thus failover should be automatic, and bringing a failed node back up should cause only minimal downtime. I want all 3 nodes to be as close to identical as possible, and be able to run with just 1 or 2 nodes available. And if possible I want to use load balancing to improve performance. If anyone can help me gain some insight into how to do this using my current setup or suggest a different/better setup. Thank you!

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• Problem with Amiga 1200 accelerator board

  - by cc0

  I just recently walked past a dump, where in the corner of my eye I spotted something that looked like a huge keyboard. I went to take a closer look, and found out that it was an Amiga 1200 with a 030 accellerator board and scala dongle. Jackpot! So anyway; I dried it, cleaned it, it works, but the floppy was not powering on and same with the harddrive. I am using an old Amiga 1200 PSU that was making some strange high pitch noise when I tried to boot the amiga with the harddrive installed in it. I removed the harddrive and it booted fine with the PSU not emitting any detectable noise. However, when I have the 030 installed it sometimes reboots and shows a red "Software Error" screen. I tried removing the memory on the board, same effect. Sometimes it does not boot at all, just gives a black screen. Someone suggested the card had problems with 3.1 roms, but this amiga has only 3.0 roms installed. Does anyone have any apparent theories as to why it seems unstable? I don't have any other Amiga parts to cross-swap with to test a lot of things, so I'd really appreciate some sound input here so I'd know what to look for in order to try fix it. And merry Christmas everyone :]

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• How do I know if I managed to completely remove an undetected trojan?

  - by ubuntuisbetter

  I catched a trojan that uses explorer.exe to reproduce itself in case of deletion of its autostart entry or main exe file in Programs/x. It had already tried to contact a suspicious server over explorer.exe, blocked that via my firewall. I: Removed the autostart entries from the registry Looked through my services if there was anything suspicious Deleted the trojan from Programs/ Went through System Volume Information to find a 2 month old explorer.exe and replaced the possibly infected one. There are no suspicious processes running now anymore (no duplicate explorer.exe) and nothing wants to connect this trojan owners sever either. I checked my system with several anti-malware programs too. What the trojan did: Started a second explorer.exe Always when I deleted the main trojan exe file it was reproduced (by the second explorer.exe) Always when I deleted the autostart entry it was reproduced by the explorer.exe too. When I terminated the suspicious explorer.exe, which used only half as much memory as the less suspicious one from Windows, a strange thing that I know from the computers in my Informatics class happened: A window popped up in the top left of my explorer-less desktop, titled "Personal settings for ... are ..." that obviously copied some files. Then both explorer.exes started again and the trojan was everywhere again. What did the trojan actually do to get explorer to rescue it? Is my PC clean of this newish trojan now? What are the other locations I should check for the trojan? The trjoan doesn't seem very high-level, could it have changed other system files or is the autostart entry vital for it? Thanks in advance, Your trojan paranoid friend (Getting linux in a week)

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• Scaling a node.js application, nginx as a base server, but varnish or redis for caching?

  - by AntelopeSalad

  I'm not close to being well versed in using nginx or varnish but this is my setup at the moment. I have a node.js server running which is serving either json, html templates, or socket.io events. Then I have nginx running in front of node which is serving all static content (css, js, etc.). At this point I would like to cache both static content and dynamic content to memory. It's to my understanding that varnish can cache static content quite well and it wouldn't require touching my application code. I also think it's capable of caching dynamic content too but there cannot be any cookie headers? I do use redis at the moment for holding session data and planned to use it for other things in the future like keeping track of non-crucial but fun stats. I just have no idea how I should handle caching everything on the site. I think it comes down to these options but there might be more: Throw varnish in front of nginx and let varnish cache static pages, no app code changes. Redis would cache dynamic db calls which would require modifying my app code. Ignore using varnish completely and let redis handle caching everything, then use one of the nginx-redis modules. I'm not sure if this would require a lot of app code changes (for the static files). I'm not having any luck finding benchmarks that compare nginx+varnish vs nginx+redis and I'm too inexperienced to bench it myself (high chances of my configs being awful). I'm basically looking for the solution that would be the most efficient in terms of req/sec and scalable in the future (throw new hardware at the problem + maybe adjust some values in a config = new servers up and running semi-painlessly).

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• How do I get to the bottom of network latency and bandwidth issues

  - by three_cups_of_java

  I recently moved two blocks south. That move moved me from Comcast to Broadstripe (high-speed internet cable providers). Comcast was pretty good. Broadstripe sucks. I called them on the phone, and they basically brushed me off (politely). I want to come to them with some numbers, so I can say more than just "it's really slow". I still have access to my old Comcast service, so I can run the tests using both providers. Here's what I'm seeing with my new Broadstripe service: 1) When I browse to most sites, there is a long delay (5-10 seconds) before the page starts loading in my browser 2) The speed test tell me I have 12 megs down (bullshit) 3) I have a server at my office. I just downloaded some files (using scp on the command line). It said I'm getting 3.5 KB/s I'm an experienced programmer and spend most of my days on the command line and in vim. Networking, however is not a strong point. I've played around with traceroute, but I'm not sure if that's the right tool to use. I have access to servers all over the country (I would just use Amazon EC2 to set up a test server), and I prefer to use Ubuntu for my testing. How can I come up with some hard numbers to show Broadstripe how crappy their service is?

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• Is 40+ Logons on Exchange 2003 per user normal?

  - by cbsch

  Hello! We've had a problem at work where users sometimes randomly can't connect to exchange. I've found out that it's because they reached the limit of 32 concurrent logons. I increased the maximum allowed connections by adding the key "Maximum Allowed Sessions Per User" in HKLM\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem. But I'm not sure if this is a real good fix. Looking at the logons some users has as many as 15 logons with the exact same logon time. I know for sure that Outlook 2007 does this, as I was watching them while a user connected with Outlook after a restart on the Exchange service. Every user also has an iPhone connected to exchange, I don't know if these cause the same thing. Is this normal? Could there be a bug in the software? (The Outlook 2007 has nothing configured, except added the user, pure vanilla installs). The users are mobile, and when Outlook generates up to 15 connection every time it connects, and I've read (no sources, sorry) that Outlook doesn't time out connections before 2 hours. I might have to set this number real high to prevent it from being a problem.

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• What is the typical maximum number of database connections for Oracle running on Windows server ?

  - by Sake

  We are maintaining a database server that serve a large number of clients. Each client typically running serveral client-applications. The total number of connections to the database server (Oracle 9i) is reaching 800 connections on peak load. The windows 2003 server is starting to run out of memory. We are now planning to move to 64bit Windows in order to gain higher memory capability. As a developer I suggest moving to multi-tier architecture with conneciton pooling, which I believe is a natural solution to this problem. However, in order to support my idea, I want the information on: what exactly is the typical number of connections allowed for Oracle database ? What is the problem when the number connections is too high ? Too much memory comsumption ? or too many sockets opened ? or too many context switching between threads ? To be a little bit specific, how could Oracle Forms application scale to thousand of users without facing this problem ? Shall Oracle RAC applied to this case ? I'm sure the answer to this question should depend on quite a number of factors, like the exact spec of the hardware being used. I'm expecting a rough estimation or some experience from the real world.

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• LMDE detects a wireless card, but can't use it

  - by Davidos

  LMDE can see my wireless card, and correctly identifies it, but it refuses to let me turn it on through the shiny graphical interface. Is there a way to use the non-shiny terminal to turn on my wireless? One small tidbit I noticed was the stated version; it says the version is 00. I believe that's hexadecimal for 0, which may indicate something screwy with the software. It would be nice if someone could tell me how to figure out how to solve this kind of problem in the future. *-network DISABLED description: Wireless interface product: Centrino Wireless-N 1000 vendor: Intel Corporation physical id: 0 bus info: pci@0000:09:00.0 logical name: wlan0 version: 00 serial: 91:e3:7b:0d:a3:a9 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-1-amd64 firmware=39.31.5.1 build 35138 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn resources: irq:43 memory:e1d00000-e1d01fff I've tested multiple other network managers, and none of them work. W ireless switch is on, I'm sure it's a driver problem.

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• Designing a persistent asynchronous TCP protocol

  - by dogglebones

  I have got a collection of web sites that need to send time-sensitive messages to host machines all over my metro area, each on its own generally dynamic IP. Until now, I have been doing this the way of the script kiddie: Each host machine runs an (s)FTP server, or an HTTP(s) server, and correspondingly has a certain port opened up by its gateway. Each host machine runs a program that watches a certain folder and automatically opens or prints or exec()s when a new file of a given extension shows up. Dynamic IP addresses are accommodated using a dynamic DNS service. Each web site does cURL or fsockopen or whatever and communicates directly with its recipient as-needed. This approach has been suprisingly reliable, however obvious issues have come up and the situation needs to be addressed. As stated, these messages are time-sensitive and failures need to be detected within minutes of submission by end-users. What I'm doing is building a messaging protocol. It will run on a machine and connection in my control. As far as the service is concerned, there is no distinction between web site and host machine -- there is only one device sending a message to another device. So that's where I'm at right now. I've got a skeleton server and a skeleton client. They can negotiate high-quality authentication and encryption. The (TCP) connection is persistent and asynchronous, and can handle delimited (i.e., read until \r\n or whatever) as well as length-prefixed (i.e., read exactly n bytes) messages. Unless somebody gives me a better idea, I think I'll handle messages as byte arrays. So I'm looking for suggestions on how to model the protocol itself -- at the application level. I'll mostly be transferring XML and DLM type files, as well as control messages for things like "handshake" and "is so-and-so online?" and so forth. Is there anything really stupid in my train of thought? Or anything I should read about before I get started? Stuff like that -- please and thanks.

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• Identifying Exchange 2010 regular process that is walking the mailbox database

  - by toongeneral

  I have an Exchange 2010 server running on a SAN-backed platform. The platform does block-level backups based on a snapshot/incremental basis, that only capture changed data. I was surprised to see a regular period of time where the data changes were happening at a high, sustained rate. Due to the way this system works, that can lead to 1.2TB of stored data per month. The regularity implied a scheduled task, but it is not a fixed interval. It is approximately every 26-32hrs. The disks were performing read operations of ~5MB/s and write operations of ~4.5MB/s, for a period of 3-4hrs. The total written data was ~55-60GB. Reading on TechNet, I am wondering if the following is causing this: http://blogs.technet.com/b/exchange/archive/2011/12/14/database-maintenance-in-exchange-2010.aspx#checksumming The somewhat restrictive thing is that the process only happens at most once every 24 hours. I was able to investigate while it was running, finding the following: the process is store.exe it is working on the mailbox database files while running, it is generating .log files (in the mailbox database folder) consistent with database changes the mailbox database is ~60GB in size, which fits with the total data changes on each iteration I have currently switched to a fixed maintenance window, as a test. It's not clear whether this is the cause, as the symptoms fit, but are not conclusive. Does anyone have any suggestions for additional troubleshooting?

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• How to fix Windows 7 device removal notification loop

  - by Barry Kelly

  Bit of an odd one this. One of our PCs is getting caught in a loop some time after being turned on, usually after a USB storage device has been attached - sometimes an iPod, sometimes a GPS. Specifically, Windows Explorer starts showing a drive icon and letter (E:, as of right now) for the System partition (the small hidden one at the start of the boot drive). Then, the icon disappears. Then it reappears again. And disappears. It does this very quickly, at what looks like maybe 50 times a second. CPU usage in this loop is also very high; averages about 66%. This machine has an i7 920 CPU, which is quad core with hyperthreading; so this usage rate works out to about 5 100% busy threads, along with whatever normal idle load is (particularly Task Manager itself). Inspecting with Process Explorer shows that the device removal notification infrastructure has gone berserk. The threads in system service processes (i.e. apart from Windows Explorer) which are using all the CPU power relate to device notification. The Disk Management MMC snap-in also fails to run when the loop starts. The only way to break the loop, it seems, is to reboot the machine. Anyone seen anything similar to this, and know of a way to fix it? Machine details: Windows 7 x64, fully patched i7 920, 12GB RAM Intel SSD 80GB (X25-M, I believe; not G2) 2TB 5.2K disk for bulk storage AMD HD 5870 Further hardware details await. I'm going to go through and update all drivers I can find.

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• Computer is dying--what should I be looking for?

  - by Will

  Okay, I'm a bit knowledgeable with pooters and such, but i'm confused. My computer is dying slowly, and I'm not sure what part is causing this. Computer details: Vista, dell machine, intel Q6600, 2.4 Core Duo (quad core), standard memory and drive (unknown manufacturer). Symptoms: I would best describe the symptoms as memory corruption. After a couple days on, I start getting applications crashing or failing to open for a lack of "resources". Sounds are corrupted. Onscreen text gets corrupted; the characters of text are garbled, not the pixels on the screen. Video memory seems untouched as I haven't seen any misplaced pixels. Recently I've lost files on disk. I've also experienced errors reporting a supposed lack of disk space, even though I have fifty gigs free. There was one point where I couldn't get to the POST when booting up. After I cleaned everything (see next) this hasn't happened. Diagnostic steps: First thing I did was clean the case. There was a lot of dust buildup on heatsinks, so I cleaned all that up. No help. Next, I disconnected and reconnected everything, from power cables to memory (did not reseat cpu). No change. Last, I ran the standard vista memory diagnostics and ran checkdisk. Both reported no errors found. I have not run any POST tests, now that I think about it. I'm at a loss at this point. Disk appears fine, memory too. I'd expect motherboard issues to result in the thing not booting up, yet it does every time. What should I be looking at? What more can I do?

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• Does OS X support linux-like features?

  - by Xeoncross

  I have been using XP for almost a decade. Contrary to popular belief, it has served me well. In the last 4 years I don't remember ever having it crash on me. It has the most stable GUI I have ever used. However, an OS is only as good as it's GUI AND command line combined. Windows command line is awful and totally useless. So I have been using Ubuntu for a couple years and Debian on my servers. The only problem is that Gnome applications (ubuntu 6-10) constantly crash on me (Ubuntu Studio was the most unstable OS I ever used). I have high quality Gigabyte, MSI, and Asus motherboards and CPU's from old Semprons/Athlons to Celerons/Core 2 Quads. What are the odds that every PC I have ever owned can't remain stable with a linux GUI? Not to mention that Adobe CSx Suite doesn't work on linux. Anyway, I am now looking at moving to a MAC in the hope of finding a stable GUI and a feature-packed command line. Does Mac OS have an integrated command line where I can do linux-like-awesomeness like rsync, ssh, wget, crong jobs, package updates, and git without having an unstable GUI? Basically, until the linux GUI applications get a little better, is OS X what I need?

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• Is it possible to use ffmpeg to trim off X seconds from the beginning of a video with an unspecified length?

  - by marcelebrate

  I need to trim the just the first 1 or 2 seconds off of a series of FLV recordings of varying, unspecified lengths. I've found plenty of resources for extracting a specified duration from a video (e.g. 30 second clips), but none for continuing to the end of a video. Both of these attempts just yield a copied version of the video, sans desired trimming: ffmpeg -ss 2 -vcodec copy -acodec copy -i input.flv output.flv ffmpeg -ss 2 -t 120 -vcodec copy -acodec copy -i input.flv output.flv The thought on the second one was: perhaps if I specified a length beyond what was possible, it'd just go to the end. No dice. I know it's not an issue with codecs or using seconds instead of timecode since the following worked a charm: ffmpeg -ss 2 -t 5 -vcodec copy -acodec copy -i input.flv output.flv Any other ideas? I'm open to using other (Windows-based) command line tools, however am strongly favoring ffmpeg since I'm already using it for thumbnail creation and am familiar with it. If it helps, my videos will all be under 2 minutes.

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