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• Database OR Array

  - by rezoner

  What is the exact point of using external database system if I have simple relations (95% querries are dependant on ID). I am storing users and their stats. Why would I use external database if I can have neat constructions like: db.users[32] = something Array of 500K users is not that big effort for RAM Pros are: no problematic asynchronity (instant results) easy export/import dealing with database like with a native object LITERALLY ps. and considerations: Would it be faster or slower to do collection[3] than db.query("select ... I am going to store it as a file/s There is only ONE application/process accessing this data, and the code is executed line by line - please don't elaborate about locking. Please don't answer with database propositions but why to use external DB over native array/object - I have experience in a few databases - that's not the case. What I am building is a client/gateway/server(s) game. Gateway deals with all users data, processing, authenticating, writing statistics e.t.c No other part of software needs to access directly to this data/database.

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• Is there any way to do 'software raid' without losing data?I

  - by user1706582

  I say software raid because that is a pretty tentative guess at what I actually want. I have two drives, both with stuff already on them which I want to combine. If they weren't full of stuff (data, not windows installation) I would use software raid to combine them into one big drive or make them into one partition. I could probably do this with some complicated reference system but really I just want to be able to keep saving things to X: without running out of space until both drives are full. Thanks in advance.

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• Dialog box in Adobe reader is scrambled

  - by Rutred

  I use win 7 and Adobe reader 11. After updating from ADobe reader 9 to 10 (automatically) I can´t see a proper dialog boxx when i print the PDF. EIther it har veryyyyy big letters or the text is missing in the Printing option box. I have tried to uninstall and reinstall several times, but there is no difference. I have also tried to download the sherife sans font. When I hade Adoobe reader 8, there was no problem. On an other computer I had the same problem, but I could resolve it by uninstalling and reinstallation Adobe reader. Rutred

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• Three displays, one video card and no eyefinity mode

  - by José F. Romaniello

  I am looking for a video card to run three monitors, it could be hdmi, dvi or vga. I want the three monitors to show an extended desktop but as three different desktops with maybe different resolutions, so when i maximize something it should be maximized only in one monitor. The information seems confusing, I think eyefinity tricks the OS to make it looks like one big display. I am sure I dont want this. So my question(s) is, is there a video card in the market that support 3 displays without eyefinity? Or can I use an eyefinity enabled card ( with one active display port) to run three monitors and disable eyefinity from the driver settings or something?

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• selective backup script in bash

  - by Sake

  Hi, I've been using this simple command (that's all I can do :) to backup the whole tree from my user data in NAS server for a year. cp -r /STORAGE /BACKUP-STORAGE/YYYY-MM-DD Unfortunately, after a year of service. My user start filling the spaces with lot of photo and cliparts (jpg, gif, bmp) And that start to make my backup process get much slower. The space is also a big issue. Now I no longer have enough space for a week-long daily backup set. I think I want to change from backup everything to backup only non-image data. How can I exclude jpg, gif, and bmp from the backup ? It's quite easy with DOS XCOPY command, but I really have no idea how to do that in bash. Thanks

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• CentOS listen to everything on the wire

  - by Poni

  I know there's a native command on linux that will output (to stdout) every "event" related to a certain network interface (be it eth0 etc'). Like there's tail -f <file> to listen on file changes.. I just can't find it. I want to see all events, incoming packets, even dropped ones. At lowest level possible. In every protocol (TCP, UDP etc'). I think WireShark is a bit too big for this as I need something very simple just to see the events, it's for testing. What's the command?

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• Hanging page loads every n loads

  - by Christian

  Hi Guys I recently moved my site to a new server (Apache 2, PHP5, MySQL5). The site is an Invision based forum. Every few posts / topics it just hangs. The data has been written because if you stop and reload, the post / thread is there. I thought it was a write issue initially, but nope. So, the data is written but the page load never completes. It doesn't leave the page where the data has been input. Whats the best way to trouble shoot this issue? The only thing I have done recently is reduce my MySQL timeouts, but I can't see that being an issue as the values are still big enough and there are no mentions of timeouts in the MySQL log. (For the record there is nothing in PHP's error log either) Thanks in advance!

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• Preinstalled Windows 8 and Linux UEFI dual boot on a laptop

  - by itchy355

  I am trying to set up Windows 8 and Arch Linux on a new Sony Vaio E14 with preinstalled windows 8. So far: installed W8 to my new SSD (switched for the original HDD) using Recovery Media shrunk the W8 partition, deleted recovery partition, disabled swap confirmed W8 booting just fine On to Arch: disabled Secure Boot in bios confirmed W8 booting just fine Booted Arch off the CD and installed everything to 4th and 5th partition set up rEFInd for EFIstub kernel bootloader After that it got worse. I was unable to boot anything else than Windows 8 (although I was glad that they at least kept working just fine). Tried: creating EFI\refind\ and putting the .efi there (as per Arch manual overwriting EFI\boot\bootx64.efi overwriting EFI\Microsoft\Boot\bootmgr.efi overwriting EFI\Microsoft\Boot\bootmgfw.efi --- YAY rEFInd shown up! So far, so good. I've kept the whole W8 Boot\ directory in EFI\windows8 and set up a boot menuentry for it; and it booted just fine. But, upon restart, everything was wrong -- 'Operating system not found' instead of any bootloader (refind or w8). Booted back into Arch using the live CD to find out that the EFI partition had erroneous FAT table. fsck.vfat fixed it, and I've found that EFI\Microsoft\Boot was back to it's original state (all refind files deleted and replaced with W8 bootloaders). I've overwritten them again and got back to rEFInd showing up correctly and Arch being perfectly bootable. After that I've tried only renaming EFI\Microsoft\Boot\bootmgfw.efi to bootmgfw.001.efi (then copying refind's .efi to bootmgfw.efi and keeping EVERY OTHER file as it was), but with exactly the same result. Tried marking the GPT EFI partition as read-only, same result. Now I'm kinda out of luck. Arch boots fine, so does W8 but it destroys the EFI partition in the process. Thanks for any ideas, Googling brought me this far and I can't find any better. PS -- windows 8 MAYBE destroys the partition upon shutdown -- when I order a shutdown in W8, it takes unusually long (about half a minute instead of ~5 seconds). So in theory I could solve this by hard-resetting the laptop instead of a normal shutdown, but that's just not nice.

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• Coding exercise for Linux Systems Admin?

  - by Prashanth Sundaram

  Hello All, I am preparing for a Systems Admin(linux) role for a big company(top 10 companies) and one of the requisite is knowledge of a language like perl, python or Ruby. I have a phone interview which involves sharing a editor with the interviewer, now what kind of coding exercise can I expect on a phone interview or a regular interview? I have used shell for most of my day-to-day tasks and occasionally Perl and python for bigger tasks. Now I don't expect them to ask Write a script that sync's AD users to LDAP? I don't think data structures, algorithms or sorting questions apply to me role? Can you give me any examples of SysAdmin related coding questions?

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• SAS Expanders vs Direct Attached (SAS)?

  - by jemmille

  I have a storage unit with 2 backplanes. One backplane holds 24 disks, one backplane holds 12 disks. Each backplane is independently connected to a SFF-8087 port (4 channel/12Gbit) to the raid card. Here is where my question really comes in. Can or how easily can a backplane be overloaded? All the disks in the machine are WD RE4 WD1003FBYX (black) drives that have average writes at 115MB/sec and average read of 125 MB/sec I know things would vary based on the raid or filesystem we put on top of that but it seems to be that a 24 disk backplane with only one SFF-8087 connector should be able to overload the bus to a point that might actually slow it down? Based on my math, if I had a RAID0 across all 24 disks and asked for a large file, I should, in theory should get 24*115 MB/sec wich translates to 22.08 GBit/sec of total throughput. Either I'm confused or this backplane is horribly designed, at least in a perfomance environment. I'm looking at switching to a model where each drive has it's own channel from the backplane (and new HBA's or raid card). EDIT: more details We have used both pure linux (centos), open solaris, software raid, hardware raid, EXT3/4, ZFS. Here are some examples using bonnie++ 4 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 194MB/s 19% 92MB/s 11% 200MB/s 8% 310/sec 194MB/s 19% 93MB/s 11% 201MB/s 8% 312/sec --------- ---- --------- ---- --------- ---- --------- 389MB/s 19% 186MB/s 11% 402MB/s 8% 311/sec 8 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 324MB/s 32% 164MB/s 19% 346MB/s 13% 466/sec 324MB/s 32% 164MB/s 19% 348MB/s 14% 465/sec --------- ---- --------- ---- --------- ---- --------- 648MB/s 32% 328MB/s 19% 694MB/s 13% 465/sec 12 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 377MB/s 38% 191MB/s 22% 429MB/s 17% 537/sec 376MB/s 38% 191MB/s 22% 427MB/s 17% 546/sec --------- ---- --------- ---- --------- ---- --------- 753MB/s 38% 382MB/s 22% 857MB/s 17% 541/sec Now 16 Disk RAID-0, it's gets interesting WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 359MB/s 34% 186MB/s 22% 407MB/s 18% 1397/sec 358MB/s 33% 186MB/s 22% 407MB/s 18% 1340/sec --------- ---- --------- ---- --------- ---- --------- 717MB/s 33% 373MB/s 22% 814MB/s 18% 1368/sec 20 Disk RAID-0, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 371MB/s 37% 188MB/s 22% 450MB/s 19% 775/sec 370MB/s 37% 188MB/s 22% 447MB/s 19% 797/sec --------- ---- --------- ---- --------- ---- --------- 741MB/s 37% 376MB/s 22% 898MB/s 19% 786/sec 24 Disk RAID-1, ZFS WRITE CPU RE-WRITE CPU READ CPU RND-SEEKS 347MB/s 34% 193MB/s 22% 447MB/s 19% 907/sec 347MB/s 34% 192MB/s 23% 446MB/s 19% 933/sec --------- ---- --------- ---- --------- ---- --------- 694MB/s 34% 386MB/s 22% 894MB/s 19% 920/sec 28 Disk RAID-0, ZFS 32 Disk RAID-0, ZFS 36 Disk RAID-0, ZFS More details: Here is the exact unit: http://www.supermicro.com/products/chassis/4U/847/SC847E1-R1400U.cfm

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• Ubuntu Lucid: Erratic screen behaviour after boot

  - by fgysin

  In short: about 50% of the time I have a screwed up monitor setup after reboot. About 50% it is totally correct. Now the longer version: I updated my machine from 9.04 to 10.04 (via 9.10). At first I run into some monitor problems (I have a 3-monitor setup) because of the known bug in the new xserver driver for xinerama. This messes up behaviour if the mouse goes either left or above the screen number 0, i.e. I had to make my left-most monitor screen 0. Everything worked out fine finally, I got my 3-monitor setup back with xinerama enabled to get one big desktop streched over 3 screens. Now the fun part: Every time I start up my machine only one of the 3 monitors gets a signal and is woken up: it only recognizes the left-most monitor (screen 0) and crams all the desktop stuff into this one screen. If I go into nvidia settings I only see one physical device although all 3 are connected and have power. When I look into the xorg.conf I can still see my old setup with 3 devices, 3 screens, xinerama active etc... But I was totally unable to get 3 montitors to work. (I tried unplugging monitors, reconfiguring whole nvidia setup, ...) But it gets even better: When I restart my machine (i.e. choose the restart option from the Ubuntu menu) it shuts down and tries to restart. The restart then gets stuck after showing the Ubuntu splash screen with the 'loading bar' (the moving dots thingy) and I am forced to kill the machine by cutting power. But after the power cut the machine boots up normally and suddenly I get my 3 monitor setup back up working. That is until the next time I shut down and start up, where it all starts over again and I only have one monitor... (see above) I really have a hard time seeing where the error is. It must be that the restart boot somehow differs from the 'normal' boot. But the fact that it gets stuck and I need to cut power which then basically triggers a 'normal' boot does not really support this theory... My setup (please tell me if you need further info): 3 monitors as 3 screens as one desktop (with xinerama) 2 nvidia cards where screen 0 and 1 are on card 0 and screen 2 is on card 1 Ubuntu 10.04 Lucid Lynx (updated from 9.10, 9.04, ....) I would appreciate every idea on the subject, at the moment I really don't have any clue what to do...

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• Zend Optimizer not Functioning Correctly on Plesk 9.3.0 VPS

  - by dallasclark

  I have a new VPS running Plesk 9.3.0 without 'much' modifications to any settings. I've moved a site to this VPS and I'm receiving a page full of random 'gibbrish' characters like: Zend2003120702116268102798xù Ÿ2½}MŒ%ÇqæCwËg¸„ÖXXZ[ÆùÿCK¢FŠäš’(’¢-ÂÒèu¿zš6gºÇÝ=$Ec:-xá=èàƒÃ ôžL/`,¼'û$èdû$ð ›±OYïUUdfde½á›GâcWTfDdF|‘™‘QÕ_nN‡OÝ›Ÿ/ú9¾¢»"…çÎ =B³øo/=÷…?úúW?·/LX5¯ß½ ðtEÍ ãB„ð÷øìÞéåU®•òÊëZÈi^¿lN/NÎNoÞ›/šÅC׸”šÅLËÏåùÉ+Ü á¸a6Ê÷Ž..ϯrç…Õ–)Õþñòüvsz•{å mî!F³ã[çWsÖZ%k'-ÐÝ<¬þZ1B¡¼ "-ÏîH @/Ü´b.Ï›ù"ü tb¼Ò!”]œ¼ïŠ6–Ál \Ü;½hÎOößh®^“4#…s¡CÀ†æôUèP³Ð§3¦¬“; –j‡ìþb¤÷š»¶³Wçç7÷îÜ…w•bÞs«[ÆÎav,@ÿ´ÜéÖåÌfž¯þVÚlö‹½ÎÛØå#Èoòudñ^÷чW+ÕSsÐý¹w˜7Ÿò«{ò…?<Ìo1»èZÄN_ð³»·îqr÷Vs¾"ýµ¾§þˆ¡v Ù.j†Çï®#{îÞüÞú¿ºý²Q0âLõ$rv¥{»[à|sÝwxþðúy¯)þ • 7ÛŽ È^YËZá‘JV<|·g“l2£{µ«Ù›=é§eCÍîõÖ»ÓÖQtL´D?ε܃ÁªÇ3=ﯸ^=þAIÏjöÐÁ0¡ò¥ 2øÙŸÞçÝÊéqÔ€Lï÷*+Jo¬õLͺFøì x¨ÕìÛ'GH“æådD)ÿ:¨5¼q±¦rÖøLf“Ðj îÅõ¬éa÷[!_zöN?þ"™†á©›0Ý{ˆWóª‘ÁH4µx5+Ë^–Ž›·ÉöŠd1¹Õ¬ phpinfo() shows PHP is running on the Zend engine. This server is unmanaged so I cannot ask the hosting provider for assistance. Any help big or small will be appreciated.

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• One of my apache processes is huge - how can I find out why?

  - by Malcolm Box

  I'm running Apache 2.2.12 with mod_wsgi, hosting a Django site. Most of the apache child processes weigh in at about 125MB RSS, but occasionally I see one child balloon to 1GB RSS. At this point there's usually 1 huge process (1GB), a couple of large ones (500MB) and the rest are still ~125MB. These are the mod_wsgi daemon processes. I've tried using memory leak tracing in Python to see if it's the Django code, and I see no leaks. Looking in the logs doesn't show any particularly strange requests. I'm stumped on how to figure out what's causing this - any ideas? Also, any workaround ways to kill the large apache process when it gets too big, without bringing apache down? Some more details: Not using mod_php Using pre-fork

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• Mysql hosting for application backend

  - by churnd

  I've been asked to help set up a way for a volunteer animal rescue organization to use an application to keep track of animals they've rescued. This application already exists, and can use it's own local database or connect to a MySQL database server. Since there are several volunteers spread out over a large region, a database server would be the best way to go. Money is a big problem, obviously. So, I'm looking for a very cheap or hopefully free database server or webhost that allows tcp/ip connections to their database servers. Backups will be handled on our end, so basically I just need the hosted mysql server. I've seen 000webhost.com, x10hosting, and xtreemhost, which all look promising, but they either aren't clear on remote mysql connections, or don't allow it at all. Looking forward to your recommendations! The animals thank you! :)

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• How can I set my wireless router to run on a time schedule?

  - by Joshua Robison

  I have a Buffalo AirStation WZR-HP-G301NH I am able to access it's settings via 192.168.11.1 I'm connecting wirelessly with toshiba i686 laptop on Linux Mint Debian with service pack 3 and i686 dual core kernel This is just my home network but I know that there must be a way for large industries to shut their networks down or lock out their network access temporarily based on a time schedule, automatically. Like mon - fri the network provides access from 8am to 10pm and then automatically shuts down. I want this to affect all the computers accessing this netowork... basically all my families computers so that the internet just automatically shuts down at bedtime. I am running Linux Mint Debian and so maybe I need to make a cron job or something but does anyone know how big industries implement this and how I can do it privately? TIA

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• off-the-shelf HDD in Dell Optiplex 755 - Invalid Replacement - Press F1 when rebooting

  - by Eric Liprandi

  I recently put an SSD into my work Optiplex 755. Since then, every time the system boots or reboots, I get prompted to hit F1 to continue with a message like HDD replacement is not valid. The system works just fine. What I am gathering from Dell's website is that I left the original drive internally as a data drive. And apparently the Optiplex does not support 2 drives in the configuration we purchased originally and complains. Any suggestions on how to get rid of this message? some suggested the MEBx or whatever from Intel and to turn it off, but I did not succeed earlier. It's not a big deal 80% of the time, but I regularly work from home and occasionally need to fire a reboot and well, you don't get the BIOS screen remotely :) Regards, Eric.

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• How to extract corrupted RAR files

  - by Anyname Donotcare

  I try to extract a file from set of .RAR parts. I always get the following error: Corrupted so I tried many programs to extract the corrupted RAR files. I have 10 parts, each one 400MB big. The last progam I used was Recovery toolbox for RAR. It gave me the following message: Severity:!High Message:Recovery error for file XXXX with message set file pointer error. The program extracted 2GB of data, but it should extract 4GB. Is there any way to extract the content or am I supposed to download the files again from another server?

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• Does multiple files in SQL Server when using RAID help reduce conflicts in growth and file-locking?

  - by Dr Giles M

  I've been reading around and get the impression that if you are using RAID then using multiple SQL Server files within a filegroup won't yeild any more improvements, and the benefits are purely administrative (if you started to run out of space or wanted to partition off data into managable chunks for backups/balancing the data around your big server room). However, being a reasonably savvy software person, it's not unthinkable to hypothesise that, even for smaller databases that SQL Server will perform growth and locking operations (for writes) on a LOGICAL file basis, so even if you are using RAID, it seems to make sense to have multiple files in a file group to balance I/O, or does the time taken to reconstruct the data from distributed filegroups outweigh the benefits of reduced locking? I'm also aware that the behaviour and benefits may be different for tables/indeces/log. Is there a good site that distinguishes the benefits of multiple files when RAID is already in place?

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• Top/left edges of screen, in Virtualbox, act like bottom/right edges

  - by Ken

  I have Virtualbox running on Windows Vista, and Debian running inside Virtualbox. Everything's running great, for the most part. Everything looks correct. But when I'm in full-screen mode, the top edge seems to act (to the mouse) like it's the bottom edge, and the left edge seems to act like the right edge. For example, if I click in the middle of the desktop and drag left, as if to select some icons, when I hit the very leftmost pixel of the screen, the selection (but not the mouse pointer) jumps to the far right edge of the screen). For the left edge, it's not such a big deal, but not having the top edge is kind of annoying: it means I can't select things from the menu in my top panel by slamming the mouse against the top of the screen. Anyone seen this before? Is there some way to make this work? Thanks!

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• Dual Screens with Widescreen monitors?

  - by nmuntz

  I want to build a new computer and purchase new monitor(s). At my old job I had two 20" 4:3 and I absolutely loved this setup. However, the stores in my country only seem to have widescreen monitors nowadays, and the only 4:3 LCDs i have been able to find are 17". My question is: Do widescreens suck for using them as dual monitors? Can anyone with this setup comment on their experience with having multiple widescreen monitors? Would it be better to get three 17" 4:3 LCDs instead of two widescreens? If i go with widescreens, should i go with the smallest ones i can find? Purchasing a single big widescreen monitor is not an option for me, since being able to maximize an app on a specific area of the screen is a must have for me and im not willing to use "hacky" apps for this purpose that do a crappy job. Thanks in advance for your advise.

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• Running .net application over a network

  - by Marlon

  Hello, I need some advice please. I need to enable a .Net application to run over a network share, the problem is that this will be on clients network shares and so the path will not be identical. I've had a quick look at ClickOnce and the publish options in VS2008 but it wants a specific network share location - and I'm assuming this location gets stored somewhere when it does its thing. At the moment the job is being done with a old VB6 application and so gets around all these security issues, but that application is poorly written and almost impossible to maintain so it really needs to go. Is it possible for the domain controller to be set up to allow this specific .Net application to execute? Any other options would be welcomed as I want to get this little application is very business critical. I aught to say that the client networks are schools, and thus are often quite locked down as are the client machines, so manually adding exceptions to each client machine is a big no no. Marlon

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• Linux Disk Setup for VMs

  - by zjherner

  Been trying to find the ideal way to setup disks/partitions for Linux guests on ESXi. Seems as though Linux is falling behind when it comes easily adding disk space. The end goal is to be able to add disk space to a Linux server without rebooting the server or taking the server offline. Ideally, I would expect adding disk to a Linux machine should be as easy as adding disk space to a Windows machine. I expand the vmdk file from vSphere Open disk mangler find the disk and extend volume. Would have to use command line tools in linux which is no big deal, but I haven't been able to find a solid way to exand filesystems on the fly. What is everyone else using for disk setups on their linux guests? Has anyone been able to acheive adding storage space to linux without downtime? Can it be done without using lvm?

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• Choosing between cloud (Cloudfoundry ) and virtual servers - for developers

  - by Mike Z

  I just came across some articles on how to setup your own cloud using Cloudfoundry and Ubuntu, this got me thinking, choosing our infrastructure, if we want to use our own servers what's the advantage of cloud on virtual servers vs just using virtual servers, VPN? If we now develop for the cloud later if we need help we can quickly move on to a cloud provider, but other than that what's the advantage and disadvantage of private cloud in these areas? speed of development, testing, deployment server management security having an extra layer (cloud) will that have a hit on server performance, how big? any other advantage/disadvantage?

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• How do I rate limit google's crawl of my class C IP block?

  - by Zak

  I have several sites in a class C network that all get crawled by google on a pretty regular basis. Normally this is fine. However, when google starts crawling all the sites at the same time, the small set of servers that back this IP block can take a pretty big hit on load. With google webmaster tools, you can rate limit the googlebot on a given domain, but I haven't found a way to limit the bot across an IP network yet. Anyone have experience with this? How did you fix it?

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• how to stop outgoing email spam

  - by James

  running an email system using roundcube, with about 200 people using it. 99% of them do as they are told and only email clients they have already spoken to, however 1% of them decide to bulk spam bcc emails, which then tripped an aol filter and almost got us banned from our host. I have disabled the guys account but I am worried about something similar happening in the future, what would be the best way to stop this? I read that if aol recieve 3 emails within 60 seconds from the same ip address then its an instant ban, so i am guessing with the big companies like google, their email accounts must have different ip addresses? and if so is there any way to implement a similar feature? Also i have spam assasin enabled, in this case what would be the best configuration for it?

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