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• Which Linux book for aspiring sysadmin?

  - by Ramy

  I have a co-worker who insists that he will never buy a book unless it is considered "THE" book. So, in this vein, I thought I'd ask what the ultimate Linux book is. I wouldn't quite call myself a complete beginner since I can get around in Linux in general pretty well. But, beyond that, I'm also looking for a book with an eye towards becoming a Sys Admin someday. I saw a Junior Sys Admin position open up recently but with the requisite 2-3 years experience, I may have to wait a little while longer before I'm ready to apply for such a position. Having said all that, I'll summarize my question: What is the ultimate Linux book for someone who is ok with the basic tasks of getting around in Linux but also wants to aim towards full Sys Admin status someday? A few examples of the books I'm considering: Linux-Administration-Beginners-Guide-Fifth Linux-System-Administration Linux-System-Administration EDIT: Before you close this question as a dup, I'd like to say that I'm looking for something that goes deeper than this: Book for linux newbies I already have "Linux in a nutshell"

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• How can I use a batch shortcut to open multiple Windows Explorer folders, and a Notepad file?

  - by ModelHX

  I've recently built a computer with an SSD in it (my first) and am in the process of moving a select few of my Steam games to the SSD and symbolically linking them to where they're supposed to be on the main (mechanical) hard drive so that Steam doesn't throw a fit and I get maximum performance. To this end, I'm finding myself repeatedly navigating to both target folders to move the relevant files and opening a specific Notepad file to enter the relevant paths into a template I've got set up that I paste into the Windows command prompt to create the symlink. This is annoying. I've read up a little bit on batch shortcuts, and have a basic understanding on how to use one to open programs and files. However, I'm finding a lot of confusing suggestions on how to use batch shortcuts to open specific folders in Windows Explorer, and none of them deal with opening multiple folders at once. Any assistance on writing the shortcut would be greatly appreciated. Thank you for your time.

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• How to benchmark apache/nginx setup

  - by Saif Bechan

  I am planning to setup nginx as reverse proxy. I will have apache to deliver my dynamic content, and nginx will deliver the static content. My configuration i have now is just Apache with fastCGI. This gives me no configuration problems and runs great. After I have set up nginx I want to run some benchmarks to see if I really got some performance increases, else i will switch back. Does anyone know how I can benchmark this type of setup? Or maybe someone did this already and have some canned results, I will be glad to hear them.

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• Http 400 'Bad Request' and win32status 1450 when larger messages are sended to a WCF service

  - by Tim Mahy

  we sometimes receive Http 400 bad request resultcodes when posting a large file (10mb) to a WCF service hosted in IIS 6. We can reproduce this using SOAP UI and it seems that it is unpredictable when this happens. In our WCF log the call is not received, so we believe that the request does not reach the ASP.NET nor WCF runtime. This happens on multiple websites on the same machine each having their own application pool. All IIS settings are default, only in ASP.NET and WCF we allow bigger readerQuota's etc.... The win32status that is logged in the IIS log is 1450 which we think means "error no system resources". So now the question: a) how can we solve this b) (when a is not applicable :) ) which performance counters or logs are usefull to learn more about this problem? greetings, Tim

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• Video acceleration problem with Windows 7 games and PPTX files

  - by Jordan 1GT

  I have a Dell xps M1330 which originally ran Vista, but I upgraded to Windows 7. When I try to run a Win 7 game like spider solitaire I receive the following message: The game is running in software rendering mode. Hardware acceleration is either disabled or not supported by your video card driver which could slow down game performance. Make sure you have the latest video card driver installed and that hardware acceleration is turned on. I confirmed that hardware acceleration is turned on. When I go to Dell's site, I'm told there is no later video driver. When I run the game it runs very choppy. I have a .pptx file which is doing strange things in normal view and I suspect it may be related to the same video acceleration problem.

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• How do I know if my SSD Drive supports TRIM?

  - by Omar Shahine

  Windows 7 has support for the TRIM command which should help ensure that the performance of an SSD drive remains good through it's life. How can you tell if a given SSD drive supports TRIM? See here for a description of TRIM. Also the following from a Microsoft presentation: Microsoft implementation of “Trim” feature is supported in Windows 7 NTFS will send down delete notification to the device supporting “trim” File system operations: Format, Delete, Truncate, Compression OS internal processes: e.g., Snapshot, Volume Manager Three optimization opportunities for the device Enhancing device wear leveling by eliminating merge operation for all deleted data blocks Making early garbage collection possible for fast write Keeping device’s unused storage area as much as possible; more room for device wear leveling.

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• Natively boot Virtualbox Image

  - by isync

  I am faced with a Windows hardware/software problem left over from another person. It's on me to resolve. It's a mission critical setup. The situation is: I've got a physical server machine with: -Disk C:\ (one disk) containing a basic install of Windows Server 2008 R2, formerly Win Vista Pro, now gone. -Disk D:\ (software Raid) containing a VirtualBox disk image of a configured Windows Server 2008 R2 running SQL Server R2 among others. What shall I do now? Migrate all the stuff from the configured VM to the basic but natively installed C:\ Windows Server 2008 R2 (with the possibility of breaking stuff)? Or, Setting up the machine to "natively boot" the VM with the help of bcdedit.exe (something I've read about, what I've never done, what I don't know of if it works, if it hits performance, or if it is stable for production) For me, being old skool, I am in the process of de-virtualising everything (option 1). But I'd be happy if someone suggests I am ok to go down the "natively boot" route.

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• how do applications (and OS) handle very big files?

  - by DrStrangeLove

  For instance, i have video file which is 11.8 Gb, but my RAM memory only 2 Gb.. How does VLC (or other software) handle it? How do they load it into memory? I used VMMap tool (from sysinternals) to take a look at memory, and i saw: private 160000K working set 100000K Obviously, it's much less than 11.8 Gb -So how did it happen? This question is not only about video. I'd like to know how computer, in general, handles very large files.

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• Unable to create context rendering error whet run OpenGL application

  - by Rodnower

  Hello, I try to run Mesa gears example and I get following error: freeglut (./gears): Unable to create direct context rendering for window 'Gears' This may hurt performance. though the application runs successfully, but I guess that in future I will have much problems with productivity. I run Linux CentOS 5 on WMvare 7. Mesa's version is 6.5 Relevant output of lspci -v gives: 00:0f.0 VGA compatible controller: VMware SVGA II Adapter (prog-if 00 [VGA controller]) Subsystem: VMware SVGA II Adapter Flags: bus master, medium devsel, latency 64, IRQ 9 I/O ports at 10d0 [size=16] Memory at d0000000 (32-bit, non-prefetchable) [size=128M] Memory at d8000000 (32-bit, non-prefetchable) [size=8M] [virtual] Expansion ROM at 30000000 [disabled] [size=32K] Capabilities: [40] Vendor Specific Information Any one have idea? There is driver of vmvare for CentOS? Thank you for ahead.

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• SQL Server 2008 data directiories in SSD

  - by Kuroro

  I am going to install a new SQL server 2008 instance on my development/testing machine. My machine have one 7200rpm 500GB SATA Disk (C:OS) and one Intel X25-G2 80GB SSD(D:). Details machine config is as follow: CPU:i7 860 RAM:8GB Microsoft said I have an option to place following directories in different disk. So I plan to place User database & Temp DB on SSD and rest of it on traditional disk. Is it a good choice for gaining a performance boost in fast SSD? Data root directory :C:\Program Files\Microsoft SQL Server User database directory D:\Data User log directory C:\Logs Temp DB directory D:\TempDB Temp Log directory C:\TempDB Backup directory C:\Backups

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• ubuntu server slowly filling up

  - by Crash893

  We had our samba server (ubuntu 8.04 ltr) share fill up the other day but when I went to look at it I cant see any of the shares have to much on them we have 5 group shares and then each users has an individual share one users has 22gigs of stuff a few others have 10-20mb of stuff and everyone else is empty so maybe like 26gigs total I deleted a few files yesterday and freed up about 250mb of space today when i checked it it was completely full again and i deleted some older files and freed up about 170mb of stuff but i can watch it slowly creep down in free space. I keep running a df -h Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 241690180 229340500 169200 100% / varrun 257632 260 257372 1% /var/run varlock 257632 0 257632 0% /var/lock udev 257632 72 257560 1% /dev devshm 257632 52 257580 1% /dev/shm lrm 257632 40000 217632 16% /lib/modules/2.6.24-28-generic /volatile what can I do to try to hunt down whats taking up so much of my hdd? (im fairly new to unix in general so i apologize if this is not well explained)

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• ubuntu server slowly filling up

  - by Crash893

  We had our samba server (ubuntu 8.04 ltr) share fill up the other day but when I went to look at it I cant see any of the shares have to much on them we have 5 group shares and then each users has an individual share one users has 22gigs of stuff a few others have 10-20mb of stuff and everyone else is empty so maybe like 26gigs total I deleted a few files yesterday and freed up about 250mb of space today when i checked it it was completely full again and i deleted some older files and freed up about 170mb of stuff but i can watch it slowly creep down in free space. I keep running a df -h Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 241690180 229340500 169200 100% / varrun 257632 260 257372 1% /var/run varlock 257632 0 257632 0% /var/lock udev 257632 72 257560 1% /dev devshm 257632 52 257580 1% /dev/shm lrm 257632 40000 217632 16% /lib/modules/2.6.24-28-generic /volatile what can I do to try to hunt down whats taking up so much of my hdd? (im fairly new to unix in general so i apologize if this is not well explained)

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• Turning off Chrome's visual effects

  - by Wesley

  Is there any way to turn off the visual effects used by Google Chrome? For example, the tabs slide around smoothly, the scrolling is really smooth, and there is a huge arrow that fades in and out during download. Reason why I'd like to know is primarily because I want to maximize battery life on my netbook by using less visual effects and, secondly, because I use Chrome on slower systems and would like to maximize the performance and efficiency of Chrome. This applies mainly to Windows XP, but also Vista, 7 and even (X)Ubuntu 9.10. EDIT1: Oh yes... disabling the attaching/detaching of tabs and turning them into translucent in the process. That's a bit stressful on my slower machines.

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• KB2494088 Always Fails : How to get it to install (or stop trying to)?

  - by Peter K.

  I have a problem where KB2494088 (a SQL Server 2008 R2 patch) continually fails to install when I reboot my system. Downloading the manual patch and trying to apply it says: The SQL Server patch package is part of a general distribution release (GDR). This package cannot be applied since this SQL Server feature has already been patched. To continue, you must install a higher version of the SQL Server patch. Most other posts (this, this) suggest it's either a failed (or cancelled) past installation or requires a SQL server repair. I've looked at registry settings and tried the repair option, but nothing seems to work.

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• Why do msi installations use slower drives over faster ones in windows 7?

  - by Joshua C

  I have noticed that the slowest drive in my system is used most during an msi installation. I mainly notice this when running windows updates but it seems to be msi installs in general. The setup I last saw this occur on was running Windows 7 with the following drives: Sata: 240GB SSD NTFS ~515MB/s Operating system drive 1TB NTFS ~110MB/s Firewire: 4TB ExFAT ~80MB/s I would think that windows would choose the fastest drive with available space for temporary files. But it will instead choose the external drive with the slowest transfer speed. I could also understand choosing the 1TB for not being an ssd in an attempt to preserve the longevity of the ssd write capacity. Why does this happen? Is there a way to force these installations to use the OS drive or a specific drive?

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• What's the downsides of Running Ubuntu 9.10 32bit on AMD64 Processor

  - by Omar Dolaimy

  Hi, I was thinking about installing Ubuntu 9.10 32bit on a DELL Inspiron 1501 with 64bit processor Laptop. Since It's was real pain to me to run Java Browser plugin, Flash Plugin, J2ME Toolkit, and many other tools. But It was 90% OK with me. This was Ubuntu 8.10 (a year ago), And now the Ubuntu 9.10 came and I'm thinking about installing the 32 bit on it and get rid of the pain. Is there a downside for that?? considering that the display card is not supported now so exclude this from your calculation, I will never play REAL games on it and I'm not a big fan of Compiz effects. I'm not here to ask about the performance (which is about 15%+ for the 64bit only), I just want compatibility!

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• video streaming infrastructure advice

  - by Alchemical

  We would like to set-up a live video-chat web site and are looking for basic recomendations for software and hardware set-up. Most streams will be broadcast live from a single person with a web cam, etc., and viewed by typically 1-10 people, although there could be up to 100+ viewers on the high side. Audio and video do not have to be super-high quality, but do need to be "good enough". The main point is to convey the basic info in the video (and audio). If occasionally the frame-rate drops low and then goes back to normal fairly soon, we could live with that. Budget is an issue, so we are in general looking for a lower cost solution that will give us most of what we need in temers of performance and quality. We are looking at Peer1 for co-lo. The rest of our web site will be .Net / Windows platform. We are open to looking at any platform for the best streaming solution, although our technical expertise is currently more on the Windows side.

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• 10,000 RPM HDD (WD VelociRaptor) vs SSD for OS?

  - by GiH

  I currently have a 10,00RPM 150GB Raptor that I use for Vista. I'm about to upgrade to Windows 7, and while doing that I thought I'd buy another drive and install Ubuntu 9.10 on it. I don't want to partition the current drive I have, but I don't need 150GB for another OS. So, I'm having trouble deciding whether its worth it to buy a 64 GB SSD at the same price point as the 150GB WD VelociRaptor? Or should I just get a 7,200 RPM drive for really cheap (around $50)? Would it be better to use an SSD for the OS than a mechanical drive? I could always get a 32GB SSD too... Oh, and I don't want to virtualize Ubuntu because I'm going to be testing to see the differences in networking and overall performance.

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• External hard drive encryption

  - by Kragen

  I've got a complete backup of my main PC on 1.5 TB external hard drive that I carry around with my laptop so I can have access to all of my files while I'm on the move, however it has just dawned on me that if someone nicks my external hard drive they now have access to everything! Hence I'm looking for a way to encrypt my external hard drive. I'm after something that is: Secure (if I need to carry around a USB dongle to keep the key on so be it) Fast (the performance of the drive should still be reasonable) Cross-platform (I regularly use other peoples computers - Sometimes they are not windows based and might not even have internet access, however I still want to be able to access my files) Cheap (preferably free / open source!)

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• NTFS disk mounted as fuseblk in ubuntu 12.10 is very slow and a lot of errors when rsync. Is that not a rare thing?

  - by Pablo Marin-Garcia

  I am having problems with a NTFS disk mounted as a fuseblk in my ubuntu 12.10 through external usb3. When I did a 1.1TB backup with rsync the speed was 1-2MB/s (wiht a ext4 disk speed was 70 MB/s before and after trying the NTFS disk). Also after one hour errors started to appear: rsync: write failed on "xxx": No such file or directory recv_files: "yyy" is a directory #but this file is a FILE not a dir ??!! .... As this is the first time I have mounted the NTFS in linux for heavy usage (the data would be used in windows afterwards), I would like to know if this kind of thinks are common o was only that something became unstable in my system and a simply restart would probably have solved it. This leads me to the these questions: Can I trust fuse for manage NTFS disks? Or is a problem of the NTFS tools in linux not yet totally stables for writing? Do people is still suffering from low performance with fuse-NTFS vs ext4 (in the past I have read about people complaining about this)?

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• XPP-32 over W7-64 on music production laptop

  - by quarlo

  I need to upgrade my laptop and need high performance for music production (recording and mixing). My audio interface manufacturer seems to be unable to successfully convert their drivers to 64-bit. I do not trust a virtual machine to handle real-time audio recording at low enough latency so ... I would like to install XP Pro 32-bit on a separate partition and dual boot since most of the machines that can handle this application now ship with Windows 7 64-bit flavors. I'd like to transit to 64-bit over time assuming M-Audio does eventually get a handle on 64-bit drivers, but really need to ensure that I can stay at 32-bit for now. Does anyone have any experience with this or something similar?

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• Thinking about buying a LG 30" monitor

  - by evan

  I'd love to get http://www.newegg.com/Product/Product.aspx?Item=N82E16824005115 but I'm wondering if I should hold out until more LED monitors are on the market. I love really like the brightness of the 27" imac monitor and the above monitor is only rated at 5 cd/m2 less than that monitor, but wouldn't a back lit monitor appear to be much brighter than an LCD monitor? Does anyone know how the above monitor compares to the 27" imac monitor? Why are Apple monitors in general so much more expensive than other monitors - just the brand name? I must be confused about how to read the specs? Thanks in advance for your input!

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• NFSv3 Asynchronous Write Depends on Block Size?

  - by Joe Swanson

  I am trying to figure out if my NFSv3 deployment is performing SAFE asynchronous writes. I suspect that it is doing strictly synchronous writes, as I am getting poor performance in general. I used Wireshark to look at the 'stable' flag in write calls, and look for 'commit' calls. I noticed that, with especially large block sizes, writes to appear to be performed asynchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=2097152 count=512 However, smaller block sizes appear to be performed strictly synchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=8192 count=655360 What gives? How does the client decide whether to tell the server to perform writes synchronously or asynchronously? Is there any way I can get smaller block sizes to be performed asynchronously?

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• Change Gnome panel profile according to number of displays

  - by ifischer

  I'm running Ubuntu 10.04 on a Laptop. I have a startup script which enables external displays, if they are connected. It runs at GDM startup, configured in /etc/gdm/Init/Default. When i'm running without external displays, Gnome should use 2 Panels. When i'm using 2 external displays, Gnome should add an additional Panel to the second display. But this should of course be removed again if i detach the external displays (and restart). Can i configure this use case by using Gnome Panel-profiles? I read that there is a startup option "--profile" for gnome-panel, but i don't know how and where i could switch the profile, especially because this has to be done after recognizing the number of displays. Or can i add a general Gnome profile and switch between those profiles somehow to achieve this behavior?

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• baffling stat pauses - (reiserfs)

  - by Twirrim

  I've got a SuSE server with reiserfs formatted partitions, all on a RAID1 mirror. I'm noticing odd spikes in iowait, but generally all seems okay. iostat claims not even 3% iowait in general: avg-cpu: %user %nice %system %iowait %steal %idle 6.53 0.03 1.45 2.92 0.00 89.07 After tracking down some odd behaviour when ls'ing, it appears "stat" (ls is aliased to include color which does a stat process on each file) randomly takes 5 seconds on a file in the directory. ReiserFS does a file system sync every 5 seconds, but that's interval between not length of time taken to sync. Out of curiosity I did remount using noatime to see if that would help though as it would reduce sync's workload, but no joy. Anyone got any thoughts what might be causing this pause? Disks appear healthy, RAID controller believes the RAID is healthy, and io stats show the disks aren't working very hard at all.

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