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• Upgrade SQLServer 2008 hardware

  - by John

  Forgive me if I'm not able to be totally clear here. It is not intentional, I'm a senior level developer in a very small company having to act like a manager at the moment. Anyway, the story is that we have 2 older dell servers with SQL Server 2008 Standard in a "cluster". I put that in quotes because I'm still not 100% clear what that means. We have 2 brand new blade servers and want to move the existing databases to the new hardware. Ok, so here is the gotcha. We need to do this with little or no down time. I'm being told that we can evict the passive node, then pull in one of the new servers. But I'm also being told that this is a dangerous step because something could go wrong that would cause the cluster to fail and then we would be left with nothing because the active server would not be able to come back up. Does anyone have any thoughts on how to handle this? I'm being told that the only way to ensure success is to have at least a day of down time where we bring up a new cluster on the new hardware and then migrate the databases 1 by 1.

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• How to avoid index.php in Zend Framework route using Nginx rewrite

  - by Adam Benayoun

  I am trying to get rid of index.php from the default Zend Framework route. I think it should be corrected at the server level and not on the application. (Correct me if I am wrong, but I think doing it on the server side is more efficient). I run Nginx 0.7.1 and php-fpm 5.3.3 This is my nginx configuration server { listen *:80; server_name domain; root /path/to/http; index index.php; client_max_body_size 30m; location / { try_files $uri $uri/ /index.php?$args; } location /min { try_files $uri $uri/ /min/index.php?q=; } location /blog { try_files $uri $uri/ /blog/index.php; } location /apc { try_files $uri $uri/ /apc.php$args; } location ~ \.php { include /usr/local/etc/nginx/conf.d/params/fastcgi_params_local; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param PATH_INFO $fastcgi_script_name; fastcgi_param SERVER_NAME $http_host; fastcgi_pass 127.0.0.1:9000; } location ~* ^.+\.(ht|svn)$ { deny all; } # Static files location location ~* ^.+\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|txt|tar|mid|midi|wav|bmp|rtf|js)$ { expires max; } } Basically www.domain.com/index.php/path/to/url and www.domain.com/path/to/url serves the same content. I'd like to fix this using nginx rewrite. Any help will be appreciated.

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• Joining new DC to AD - DNS name does not exist

  - by Andrew Connell

  I had a DC fail on me recently and trying to add a new one to my domain, although I'm sensing I might have other issues in my domain. I'm a dev at heart and know just enough about AD to be dangerous so looking for some assistance. My working DC is RIVERCITY-DC12. I'm trying to promote RIVERCITY-DC14 as a DC to the RIVERCITY domain, but when I run DCPROMO, at the NETWORK CREDENTIALS step where I point to the name of the domain (rivercity.local), I get "An AD DC for the domain rivercity.local cannot be contacted" and in the details see "The error was DNS name does not exist" Looking at RIVERCITY-DC12, I can see DNS is working, I've been able to query it from other machines in my domain, and no errors are reported in the DNS category within the Event Viewer. When I checked the FMSO roles, it shows RIVERCITY-DC12 is the machine for all listed roles. Not sure what I should do next or how to troubleshoot/investigate after searching around for a solution... ideas? Environment: Domain: rivercity (rivercity.local) Forest functional level: Windows 2000 (I'm more than happy to raise this) Windows Server 2008 All servers are Windows Server 2008 R2 SP1 (fully patched)

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• SQL Server 2005 SE SP3 on Windows Server 2008 R2 x64 premature query disconnections

  - by southernpost

  New Dell PowerEdge R910, 4x8 Intel X7560, 192GB RAM, hardware NUMA, local RAID, Broadcom NetExtreme II multiport NIC, unteamed, TCP Offload disabled, RSS disabled, NetDMA disabled, Hyperthreading disabled. SQL Server 2005 SE x64 SP3 on Windows Server 2008 R2 EE x64. No other apps on server. Max Mem = 180GB, Max DOP = 4. Existing Windows Server 2003 R2 EE x64 app server connecting to Dell via firewall using SQL Authenticated logins. Symptoms: Intermittent errors at the app server: A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.) Findings: Running queries from SSMS located on another machine within the same domain as the SQL Server run without error. SQLIO showed good performance. Windows and SQL logs show no related messages. Microsoft reveiwed PssDiag trace and stated that "We are not seeing timeouts from SQL Side. The queries bring run against the database are timing out within 9secs. This is a database connectivity error." "we can also see from the AttnSeq column that we are also not seeing any Attentions from the SQL Side.". Dell has confirmed that we are using the latest Broadcom drivers.

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• I have a password protected USB drive with hidden partition, how to convert to normal USB drive?

  - by deddebme

  I have a generic USB drive which has password protection, and I want to stop this password protection mechanism and to use it as a normal 8GB USB drive. I received this USB drive as a gift in Hong Kong, and there was no instruction menu whatsoever, not even the manufacturer name. When I plug the drive in Windows XP, the removable drive comes up as a read only 5.28MB partition with two files. When I try to add or remove any files or formatting it, it will says the drive is write protected. After launching the Login.exe and typed in the password, a 8GB read/writeable partition will be shown, and I'm free to do anything to it. But once after the drive is unplugged and replugged, the same read only partition will still comes out no matter what I did to the hidden partition. Anyone knows about this kind if USB drive? What did the manufacturer do to hide the partition? Is there a way to "low-level" formatting this drive to convert (or revert) it to a normal drive? Before typing in the password: After typing in the password:

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• Java: very slow tomcat and too big war file

  - by NaN

  I created some sort of RESTful API backend for a mobile app. It's written completely in Java using Jersey as Framework. At the moment no database is used, it's all in the memory, but this is no problem so far (it's only for prototyping purposes). I ordered the smallest package from digital ocean and installed tomcat7. All in all tomcat works, but I have three major problems: 1) It takes a long time until tomcat deploys the app: I deploy it per tomcat manager and it takes about 2 minutes unit the site works (excl. war upload time). 2) The war files are quite big (16MB): I don't know why they are so big. There are no database dependencies and most logic is written in plain java. Okay, we are using jersey, but 16MB are a lot for the logic of a small webservice. 3) I have to restart tomcat all 3 days or so. It looks like a memory leak or something similar. If the app runs for a few days the response time is quite high and the server seems to be frozen. It works again, if I restart tomcat per ssh. You can find my mvn pom file right here. Do you have some tips? Are there good tomcat alternatives?

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• Having trouble keeping a 1GB RAM Centos server running

  - by Josh

  This is my first time configuring a VPS server and I'm having a few issues. We're running Wordpress on a 1GB Centos server configured per the internet (online research). No custom queries or anything crazy but closing in on 8K posts. At arbitrary intervals, the server just goes down. From the client side, it just says "Loading..." and will spin more or less indefinitely. On the server side, the shell will lock completely. We have to do a hard reboot from the control panel and then everything is fine. Watching "top" I see it hovering between 35 - 55% memory usage generally and occasional spikes up to around 80%. When I saw it go down, there were about 30 - 40 Apache processes showing which pushed memory over the edge. "error_log" tells me that maxclients was reached right before each reboot instance. I've tried tinkering with that but to no avail. I think we'll probably need to bump the server up to the next RAM level but with ~120K pageviews per month, it seems like that's a bit overkill since it was running fairly well on a shared server before. Any ideas? httpd.conf and my.cnf values to add? I'll update this with the current ones if that helps. Thanks in advance! This has been a fun and important learning experience but, overall, quite frustrating! Edit: quick top snapshot: top - 15:18:15 up 2 days, 13:04, 1 user, load average: 0.56, 0.44, 0.38 Tasks: 85 total, 2 running, 83 sleeping, 0 stopped, 0 zombie Cpu(s): 6.7%us, 3.5%sy, 0.0%ni, 89.6%id, 0.0%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 2051088k total, 736708k used, 1314380k free, 199576k buffers Swap: 4194300k total, 0k used, 4194300k free, 287688k cached

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• Improving performance by using an additional static file server

  - by Max

  Hello there, I´m planning for a large website that includes many static assets (js, css, images and thumbnails) in the generated pages. That website will use TYPO3 as CMS (is is a customer requirement). I guess I could seriously improve performance / page load times by using a two server setup. One server where the main application (PHP) runs and another one where the static files sit being served by a trimmed down version of apache or something like lighthttpd. Including e. g. js or css files from the file server is of course no big deal. Just use an absolute url http://static.example.com/js/main.js and be done with it. But: that website will have pages with MANY thumbnails of e. g. product images on it. So I see two problems when the main application tries to create a thumbnail of some image: the original image like products/some.jpg is uploaded on the static file server and therefore not on the same server as the PHP application which tries to create the thumbnail. TYPO3 writes created thumbnails to a temp directory which is expected to be on the same server. Therefore, hundreds of thumbnails will be written and served from that temp directory which is on the same server as the main application - the static file server is in that case basically useless, all thumbnails will be requested from the server of the main application. So, my question is: how to overcome this shortcomings? Is it possible to "symlink" some directories to another server? So, for example, if PHP tries to open the original products image for thumbnail creation with imagecreate("products/some.jpg") the products folder actually "points" to the products folder on the static image server? I know something like this can be done with .htaccess but is it possible on file system level?

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• Switched from DVI to HDMI, possible audio artifacts?

  - by I take Drukqs

  I'm using an ASUS VH236H monitor and an EVGA GeForce 570 GTX both of which are brand new. My monitor has an audio out port for speakers/headphones so I plugged in my headphones and made a random selection from my library when I noticed two things: There are static-like artifacts during "louder" parts of songs. There's what seems to be a volume cap in place. When I crank the volume past 100% in VLC the decibel level does not truly increase but the amount of static does. The cable is not new; I yanked it off of my PS3 when my DVI cable broke. It has been used a good amount on my HDTV and PS3 so I doubt it's a matter of burn-in. I like the way the setup works with an HDMI cable as opposed to DVI because my headphones barely reach my rig whereas I have plenty of slack when they're plugged into my monitor. Thanks in advance for any support. Note: I'm using a high quality HDMI cable from monoprice, AKG K702 headphones, and VLC media player.

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• Setup: Eclipse in Ubuntu with Apache2 and Subversion

  - by Ricalsin

  Trying to setup Eclispe. I am running ubuntu 10.10 (Maverick). Apache2.2.16 Subversion 1.6.12 The Eclipse help/about/installed software says: Eclipse Platform 3.5.2 Subclipse 1.0.0 Version Control with Subversion 1.1.1 The Subclips wiki I followed is here I have installed the libsvn-java app as discussed. I added the line "-Djava.library.path=/usr/lib/jni" to the eclipse.ini file I checked the Eclipse help/about/confirguration settings and both of these lines are listed: eclipse.vmargs=-Djava.library.path=/usr/lib/jni java.library.path=/usr/lib/jni I checked that those files are in those directories. Still, when I check the preferencesteamsvn an error dialog shows: Failed to load JavaHL Library. These are the errors that were encountered: no libsvnjavahl.1 in java.library.path Incompatible JavaHL library loaded 1.3.x or later required I followed the "Testing JavaHL libraries" troubleshooting section at the bottom of the wiki: I downloaded the tarbal and ran it in a folder on my desktop with no problems. Then, I followed the instructions and placed that file INSIDE the path (usr/lib/jni/testJavaHL) and ran it from there. There are 50 tests performed and each one of them came back with this same error (posting only one for brevity): 50) testCommitRevprops(org.tigris.subversion.javahl.BasicTests)java.io.FileNotFoundException: /usr/lib/jni/testJavaHL/local_tmp/greek_files/iota (No such file or directory) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.<init>(FileOutputStream.java:209) at java.io.FileOutputStream.<init>(FileOutputStream.java:160) at org.tigris.subversion.javahl.WC.materialize(WC.java:70) at org.tigris.subversion.javahl.SVNTests.buildGreekFiles(SVNTests.java:303) at org.tigris.subversion.javahl.SVNTests.setUp(SVNTests.java:222) at org.tigris.subversion.javahl.RunTests.main(RunTests.java:111) FAILURES!!! Tests run: 50, Failures: 0, Errors: 50 Any ideas as to how/why the "local_tmp/greek_files/iota" is appended to the directory? I assume that's my problem.. I'm also having a problem with newrepository location = ...as the directory location of my svn repository is one level above the home directory - which is prepended to whatever I place in the dialog box - resulting in this error: svn: '/home/ricalsin/file:/home/svn' does not exist Thank you for any help.

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• Windows 7 Professional Cannot Connect to Share - Wrong password

  - by henryford

  I know that this question has actually been asked a few times before, but every solution I found didn't yield any results on my end, I can't get my head around it: When I am trying to connect to a share on the network, I always get the response "The specified network password is incorrect". However, the password is definetly correct and it works if I connect from another machine. I changed the LAN Manager authentication level to "Send LM & NTLM - use NTLMv2 session security if negiotated", I configured Kerberos encryption types to include all suites, rebooted (several times), but still - no luck. I can connect if I use my regular account with which I am logged in, but I need to connect with a different user since my log-in user has not enough privileges on the share. When I do that, the error above comes up. I'm really frustrated at the moment, this problem is driving me crazy. I'd be gladful for any possible solution to this. At the moment I'm using a workaround: I connect to a different machine via RDP, login with the user I have to use for the network-share connection and then I can map the drive and copy/paste from the RDP session to my local workstation. This is also working when I am connecting via RDP with my current login user and map the drive with the other user who has sufficent privileges. Tanks in advance, Thomas

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• Why is dwm.exe using so much memory?

  - by Leonard Challis

  I've scoured the web, but I'm sick of reading "scan your computer for viruses" and "upgrade your RAM" on answers to similar questions to this. I understand that dwm.exe is for (simply put) caching bitmaps for things like Aero-peek and similar, but as far as I have read it shouldn't be using vast amounts of memory. My colleague and I both have 4GB of RAM, Core 2 Duo, blah, blah -- essentially they're pretty capable. His dwm.exe is running at around 30mb, mind is currently running at about half a gig, though it does fluctuate quite a lot. This is the same while running the exact same applications (currently Zend studio, FireFox (with firemin - low memory usage), Outlook). Every so often I will get a notification asking me if I want to switch to Aero Basic because it's using too much memory, and sometimes it will just switch itself to basic and let me know why. I know it's possible to stop it switching, but I want to know why it is using too much memory otherwise it's just papering over the cracks. One thing to add is this seems to have started after a robbery on Monday, where two of my monitors were stolen, and I had to temporarily use a couple of alternative monitors. I am now using brand new monitors but the problem is the same. All drivers installed and working seemingly fine. Any ideas why the usage is so high? We are using windows 7 64-bit Professional.

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• i7 Windows 7 laptop or Macbook Pro 15" (For making 3D model and Animation)

  - by sppdhs

  Hi everyone, I'm thinking of buying a new laptop as my current one will be 5 years old next year and it currently gives me a blue screen everytime I run a heavy software to make 3D models and animation. Question is: Should I buy Macbook Pro or a Windows 7 laptop? I tried to research and some say that Windows would be better, especially because you can buy a very high spec laptop with cheaper price. While some other say Macbook Pro is the better choice as it can run bootcamp with windows 7 100% performance on every software even though it's a mac. Is this true? Which one is actually better? Btw, the software that I usually use is 3Ds Max, Maya, and ZBrush. To note as well, I have never used a Mac before. I've checked around some stores and budget wise, I'll need around AU$3000+ to buy a Macbook pro, and AU$2000+ to buy a windows laptop. Quite a big difference in price range. Thanks in advance for your help.

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• 3000 videos songs... some are loud in voice & some low.. I want to make them equal (equal in volume only)

  - by Mister.9

  I have thousands Video flv/avi files, which are all songs only. Some of them are high in volume and some are low. Every time the song ends I have to up or down the volume at once..to escape my ears ruined by headphones... and by woofers, save my life from my neighbor sleeping after hard-earning all the day long. :-( Any idea to make all files sound equal? Does such kind of application/software exist? Any converter that may convert all audio files into same volume? I know iTunes has sound-check option but can it convert? If I want to write CDs, does any burner have the feature like this, to burn in equal sound? If yes, suggest something for me... For, I am really really worried... It would be a great help..... Hoping your kind reply, Thanks in advance! (I am I am John.martin188@yahoo for having mails also in this regard)

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• No password is complex enough

  - by Blue Warrior NFB

  I have one user in my AD domain who seems to not be able to self-select a password. I may have another one, but they're on a different enough password-expiration schedule that I can't remember who it is right now. I can set a password via ADU&C just fine, but when he tries it via C-A-D he gets the "doesn't meet complexity" message. Figuring he was just doing something like 'pAssword32', I did some troubleshooting of my own and sure enough it doesn't want to take a password that way. He's one of our users that habitually uses a local account and then maps drives using his AD credentials so he doesn't get the your password will expire in 4 days, maybe you should change it prompts, so he's a frequent "my password expired, can you fix it" flyer. I don't want to keep having him set it via ADU&C over my shoulder every N days. I'm just fine setting temp passwords of 48 characters of keyboard-slamming and letting him change it something memorable. My environment is at the Windows 2008 R2 functional level, and I am using fine-grained password policies. In fact, I have two such policies: For normal users (minimum length, remembered passwords) For special utility accounts The password complexities I've tried match both policies for length and char-set selection. The permissions on the User object themselves look normal, SELF does indeed have the "Change Password" right. Is there some other place I should be looking for things that can affect this?

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• Improve wireless performance

  - by djechelon

  Hello, I have a Trust Speedshare Turbo Pro router, which is running on channel 6. I found that the wireless signal (and network performance) dramatically drops from my PDA (I can barely attach to the network, even if I set the PDA's energy settings to maximum wireless performance) when I even exit my room, and I don't have shielded walls or something like that. I can't even stream a SD video from my desktop (connected via LAN) to my laptop using WiFi, while via LAN it works fine. I read that changing router's channel could improve performance due to interference reducing. I found that almost all wireless networks around here run on channels 6 and 11. I tried to go to my router's settings page to change channel, but I found that the combo box only allows me to select 6!! I'm not sure, but I may have been able in the past to change channel, though not to all of the available channels. A few minutes ago I tried a firmware upgrade, but it didn't solve my problem. My question is Is it possible that my router is someway locked to its channel? I bought it on my own, I didn't receive it from my ISP Apart from boosting the antenna power to the maximum (which, by the way, increases the EM radiation my and my family's bodies absorb 24/7 and is little more environment-unfriendly), do you have any tips on getting high quality transmission up to 5 metres from the antenna? Thank you

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• No sound out of headphone port on laptop

  - by Thanatos

  I cannot get sound out of the headphone port on a laptop. Headphones are plugged in, and sound comes out of the internal speakers. Windows behaves normally (sound switches to headphones when headphones are inserted). It did work in Linux at one point, but something changed, we're just not sure what. Rebooting doesn't fix. This appears to occur whether or not PulseAudio is running. Things I've tried: Rebooting. No effect. Booting into Windows. It works properly, so probably not a hardware issue. All of alsamixer. My only controls are this: "Master" Volume bar & mutable, unmuted. Controls volume. "PCM" Volume bar only. 100%. "S/PDIF" Mutable only, currently muted, has no effect. "S/PDIF" Default PCM", Mutable only, currently unmuted, has no effect. Killing PulseAudio. No effect. (It also won't stay dead! Something appears to be restarting it, and I can't tell what, but it is annoying as fuck.) alsactl init 0, no effect. sudo rm -f /var/lib/alsa/asound.state, no effect. General system info: Ubuntu 10.04 LTS Toshiba Satellite T135D-S1324 lspci says I have: 00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA) 01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller Some edits: Yes, the headphones are in all the way. This works in Windows: You plug headphones in, the internal speakers stop making noise, and noise comes out the head phones. Windows says I only have two sound cards: the HDMI port (which I don't care about) and the "sound card", which it claims is a "Conexant Pebble High Definition SmartAudio" In Windows, both the internal speakers and the headphone jack show up as one soundcard, which in my experience, is typical. (This is a laptop)

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• Looking for way to log process terminations on OS X (Mac)

  - by Stan Sieler

  I'm looking for a way to log all process terminations on my Mac (OS X 10.6.8). (And see pid, timestamp, process name) I've implemented something similar for HP-UX, but it required a kernel-level driver and intercepting several variations of "exit()" (the normal one, and the one invoked on behalf of a process while it's aborting). Why do I want the info? I've been seeing messages in my system log file (dmesg) like: CODE SIGNING: cs_invalid_page(0x1000): p=91550[GoogleSoftwareUp] clearing CS_VALID CODE SIGNING: cs_invalid_page(0x1000): p=92088[GoogleSoftwareUp] clearing CS_VALID Although dmesg lacks timestamps, apps/Utilities/Console : Database : all : search for CS_VALID shows that the messages appears about once every 58 1/2 minutes. I suspect the number after "p=" is a process id (pid) ... but for a process that has long since terminated by the time I see the message. So, if there was a process termination log mechanism that recorded the pid, the time of termination, the reason for termination, and the process name (at time of termination), that would probably allow me to determine who's causing those errors to be logged! (No, I'm not running Chrome on my Mac, and "ps -ef | grep -i goog" gets no hits either ... I'm not consciously running any Google apps on the Mac) thanks, Stan [email protected]

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• Performance data collection for short-running, ephemeral servers

  - by ErikA

  We're building a medical image processing software stack, currently hosted on various AWS resources. As part of this application, we have a handful of long-running servers (database, load balancers, web application, etc.). Collecting performance data on those servers is quite simple - my go-to- recipe of Nagios (for monitoring/notifications) and Munin (for collection of performance data and displaying trends) will work just fine. However - as part of this application, we are constantly starting up and terminating compute instances on EC2. In typical usage, these compute instances start up, configure themselves, receive a job from a message queue, and then get to work processing that job, which takes anywhere from 15 minutes to over 8 hours. After job completion, these instances get terminated, never to be heard from again. What is a decent strategy for collecting performance data on these short-lived instances? I don't necessarily need monitoring on them - if they fail for whatever reason, our application will detect this and handle re-starting the job on another instance or raising the flag so an administrator can take a look at things. However, it still would be useful to collect information like CPU (user, idle, iowait, etc.), memory usage, network traffic, disk read/write data, etc. In our internal database, we track the instance ID of the machine that runs each job, and it would be quite helpful to be able to look up performance data for a specific instance ID for troubleshooting and profiling. Munin doesn't seem like a great candidate, as it requires maintaining a list of munin nodes in a text file - far from ideal for an environment with a high amount of churn, and for the short amount of time each node will be running, I'd rather keep the full-resolution data indefinitely than have RRD water down the data over time. In the end, my guess is that this will require a monitoring engine that: uses a database (MySQL, SQLite, etc.) for configuration and data storage exposes an API for adding/removing hosts and services Are there other things I should be thinking about when evaluating options? Perhaps I'm over-thinking this, though, and just ought to run sar at 1-minute intervals on these short-lived instances and collect the sar db files prior to termination.

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• Change Windows Authentication user for Sql Server Management Studio

  - by Asmor

  We're using Sql Server 2005 with Windows Authentication setup. So normally, when you log in using e.g. Sql Server Management Studio, it forces you to log in at MACHINE_NAME\Username. Anyways, on this one particular computer, the person said they had to make a new account called User01 to do something and showed me where she'd created it under security in the "master" system database. And so now when she logs in, it's listed as MACHINE_NAME\User01 (not the actual Windows user name). It's still set to Windows Authentication, though, and I'm unable to change the login name. Now here's where the real problem comes in... I didn't realize that she was being logged in under this user name at the time, and I disabled it to see what would happen. Now I can't log into the server under her account. I created a new account in Windows called test, and as expected SSMS had the username as MACHINE_NAME\test, and I was able to log in fine. However, the area where the User01 account was listed is not visible to me as far as I can tell and so I can't reenable it. I also tried running the following query: alter login User01 ENABLE And got this error: Msg 15151, Level 16, State 1, Line 1 Cannot alter the login 'User01', because it does not exist or you do not have permission. So in a nutshell, ideally I'd like to reenable User01 somehow, just to get things back to where they used to be. Failing that, how can I force SSMS to log in using the Windows account name as it should be, rather than trying to use User01?

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• What is the best private cloud storage setup

  - by vdrmrt

  I need to create a private cloud and I'm searching for the best setup. These are my 2 most important requirements 1. Disk and system redundant 2. Price / GB as low as possible The system is going to be used as backup setup which will receive data 24/7 over SFTP and rsync. High throughput is not that important. I'm planning to use glusterfs and consumer grade 4TB hard-drives. I have worked out 3 possible setups 3 servers with 11 4TB HDD Setup up a replica 3 glusterfs and setup each hard drive as a separate ext4 brick. Total capacity: 44TB HDD / TB ratio of 0.75 (33HDD / 44TB) 2 servers with 11 4TB HDD The 11 hard-drives are combined in a RAIDZ3 ZFS storage pool. With a replica 2 gluster setup. Total capacity: 32TB (+ zfs compression) HDD / TB ratio of 0.68 (22HDD / 32TB) 3 servers with 11 4TB consumer hard-drives Setup up a replica 3 glusterfs and setup each hard-drive as a separate zfs storage pool and export each pool as a brick. Total capacity: 32TB (+ zfs compression) HDD / TB ratio of 0.68 (22HDD / 32TB) (Cheapest) My remarks and concerns: If a hard drive fails which setup will recover the quickest? In my opinion setup 1 and 3 because there only the contents of 1 hard-drive needs to be copied over the network. Instead of setup 2 were the hard-drive needs te be reconstructed by reading the parity of all the other harddrives in the system. Will a zfs pool on 1 harddrive give me extra protection against for example bit rot? With setup 1 and 3 I can loose 2 systems and still be up and running with setup 2 I can only loose 1 system. When I use ZFS I can enable compression which will give me some extra storage.

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• Video card not detected in POST on initial boot.

  - by Jeff M

  I have a minor problem with my desktop computer after cleaning it out for dust. When I first boot up the computer, the video card does not get detected so I can't see anything. In POST, I'm getting the "can't detect video card" beeps. The boot sequence continues normally, just without video. However, if I restart it (using the restart button) anytime after POST, it would boot up normally. I have no reason to think that the motherboard, video card or PSU got damaged in the process. It was working fine before, works fine after resetting. Took all the necessary precautions while cleaning. On the initial boot, I can hear the video card's fan power up but immediately power down and try again one more time only to fail. After the beep, resetting gets everything running and sounding normally. I've reseated the card a couple of times and reset the BIOS but doesn't seem to help. I'm hoping I won't have to take it out and remove and reinstall everything again. Does anyone recognize these symptoms to know exactly what the problem is? My guess is that the video card isn't getting enough juice initially to be running stable to be detected. I just don't know what I did (or didn't do) to get it to be in this state. It's not a high priority thing for me at the moment, just means I have to always reset it after initially turning it on but will eventually remove everything and reinstall if it comes to that. I don't think the specs are relevant here but just in case, here's the relevant stuff: Motherboard: Gigabyte P35-DS3P Video: EVGA GeForce 8600 GTS PSU: Antec True Power Trio 650W Built ~2 years ago, still running well

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• Automated Linux VMs on Hyper-V 2012

  - by Mick

  I have a requirement to create a ton of linux VMs for our customers (we run managed infrastructure) on Hyper-V 2012 in the coming months and I have an issue with automating it. Here is how I need it to work: User accesses their web page and creates a VM. VM is created with a unique IP and name User logs in over SSH I know Hyper-V quite well and can work with powershell and am a C# programmer so the development side of things is taken care of. I also know enough about Linux to be at least competent: I have used it on and off for a number of years but not done anything Enterprise-level with it. All this can be done easily by manual processes but I need to be able to script or program this to automate it as there could be hundreds of them being created but I don't know how. My first thought is to have a database with random-generated names and IPs already created but I don't know how to get a Linux VM to boot up and grab one from the database... I suppose a Kickstart script would take care of it but I don't know what to do from there. Here is what is bouncing around in my head: Create a std linux build. - Easy to do Someone clicks "Create VM" and I pull a name and IP from the database and write it to a kickstart script. - Easy to do I could then open the template VHDX file and copy in the script and then save it. - Not sure if possible User boots up new VM and the kickstart script gives it the name and IP I assigned it. My problem is that I don't know how to open a VHDX file and insert a kickstart script into it... can't figure it out. I am reaching here and this solution may be miles off... I am more used to creating Windows VMs with scripts and so on which i am more familiar with... any help would be appreciated. Thanks Mick

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• Technology mash: is this possible?

  - by Jon Story

  I'm in the process of setting up my own DNS+hosting on a couple of VPS and my home machines, mostly for academic/learning purposes, but also for convenient accessing of my files, hosting my personal websites, private git repositories etc. I've got a main web server with DNS, and a slave DNS server. I've also got a couple of machines at home doing file hosting, video streaming and all that fun stuff. I'm intending to use my VPS's to provide myself with a dynamic DNS system so that I can point mydomain.com at my DNS servers, with home.mydomain.com going into my home network via a raspberry pi. HOWEVER.... I've not got access to the network infrastructure at home (rented accommodation with managed internet), so I can't forward the ports on the router to my own machines. As such, I'm wondering if it's possible to route all the traffic via an SSH/HTTP tunnel through one of the VPS? My plan is to have the raspberry pi provide a VPN into my home network. The raspberry pi uses SSH to connect to the VPS, and the VPS forwards any traffic to home.mydomain.com via the tunnel to the raspberry pi. Is this even possible, and how do I go about it? I don't mind getting my hands dirty with coding and low level tools, I'm just not sure where to start or what the best way to go about it is.

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• How can I use wildcards in an Nginx map directive?

  - by Ian Clelland

  I am trying to use Nginx to served cached files produced by a web application, and have spotted a potential problem; that the url-space is wide, and will exceed the Ext3 limit of 32000 subdirectories. I would like to break up the subdirectories, making, say, a two-level filesystem cache. So, where I am currently caching a file at /var/cache/www/arbitrary_directory_name/index.html I would store that instead at something like /var/cache/www/a/r/arbitrary_directory_name/index.html My trouble is that I can't get try_files, or even rewrite to make that mapping. My searching on the subject leads me to believe that I need to do something like this (heavily abbreviated): http { map $request_uri $prefix { /aa* a/a; /ab* a/b; /ac* a/c; ... /zz* z/z; } location / { try_files /var/cache/www/$prefix/$request_uri/index.html @fallback; # or # if (-f /var/cache/www/$prefix/$request_uri/index.html) { # rewrite ^(.*)$ /var/cache/www/$prefix/$1/index.html; # } } } But I can't get the /aa* pattern to match the incoming uri. Without the *, it will match an exact uri, but I can't get it to match just the first two characters. The Nginx documentation suggests that wildcards should be allowed, but I can't see a way to get them to work. Is there a way to do this? Am I missing something simple? Or am I going about this the wrong way?

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