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• SAN typical MTBF

  - by Adrian K

  We're using a SAN on a project at work, and there's a bit of debate around the fact that's technically it's a Single Point of Failure. No one seems to have any hard data. The SAN in question is a single physical box, but with internal redundant components (sorry - not sure3 what level of RAID it has, but I can find out). What's the tyopical MTBF for a SAN? The PM has it down on the projects risk register as "Quite Common' - I've never heard of a SAN going down, but I don't jhave any stats to show how likely it really is. Does anyone have any helpful info?

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• How do I set up failover for a single web server using two ISPs?

  - by Travis

  I have one web server and two WAN connections (1 cable, 1 DSL). DNS is run offsite, and points to the IP address assigned by one of the ISPs. How can I have the second connection take over when the primary one fails? I have seen that it is possible to have two A records, each pointing to a different IP, but it has several problems. What's the real solution to this? I imagine this is a very common issue. Thanks in advance!

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• Windows XP environment variable editor replacement that handles lines

  - by Codism

  I'm looking for an environment variable editor that handles linebreaks well. I have a monster %PATH% to edit (edited to save side-scrolling): C:\Program Files\Windows Resource Kits\Tools\;C:\Program Files\PC Connectivity Solution\;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem; C:\cygwin\bin;C:\Program Files\Microsoft SDKs\Windows\v6.0A\Bin;C:\WINDOWS \system32\WindowsPowerShell\v1.0\;C:\Utils;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\; C:\Program Files\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\; C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\PrivateAssemblies\; C:\Program Files\MKVtoolnix;C:\Program Files\Common Files\Roxio Shared\ DLLShared;C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE I want the editor to put each path in a line and when I click save & close, for the editor put the lines back in the right format. Is there an editor that can do that?

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• High CPU usage when running a CentOS guest in VirtualBox

  - by sagi

  I am running CentOS 5.3 as a VirtualBox 3.0.0 guest running on Windows XP. The Windows host CPU usage is constantly at 50% although the CentOS guest is completely idle (i.e. 0.00 load average). I know this is a common problem related to the 1000Hz frequency that the CentOS kernel runs at, and previously a special kernel-vm packages were released to resolve the issue. However, these packages are out of date and the README says that they are not not necessary as of CentOS 5.3. I found out that there is supposedly a kernel parameter divider=10 that reduces the frequency to 100Hz with the standard kernel but it doesn't seem to have any effect when running inside VirtualBox. Is there any way to resolve the issue without resorting to a custom kernel?

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• Why can't I install apps on Windows 8 using specific dial-up modem connections?

  - by Vincent of Earth

  This problem has persisted since I first tried out Windows 8 Consumer Preview, and also affects Windows 8, Windows 8.1 Preview, and Windows 8.1. Specifically, the problem occurs when I try to install apps from the Windows Store on a Globe Tattoo Broadband or Smart Bro dial-up connection (two common ways of connecting to the internet in the Philippines). I can confirm that this isn't a problem with my copy of Windows or my Microsoft account because I was able to install any app on other connections like public WiFi. This problem has persisted on three different dongles and two different computers. So why can't I install apps on those two specific types of connections?

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• Building php-devel package from source (php 5.3)

  - by BajaBob

  I am building PHP 5.3 rpm packages for our custom CentOS 5 yum repo. I am fairly new to building rpms to be honest, but I have had moderate success downloading the SRPMS for a given package and repackaging them using "rpmbuild --rebuild" command. One thing that is throwing me off though is how to satisfy the php-devel package.. I obviously have the PHP 5.3 source files as I was able to build my php-common and other packages with it. But I am not sure how to actually build the devel package! From what I understand, I already have most of what I need - the latest php 5.3.5 source tarball. However I am not sure how to build the correct .spec file to satisfy what I need. If you are knowledgeable in this area, would you mind helping a fellow sysadmin out? Sharing a spec file or at least giving me some pointers on how to approach it. Thanks much serverfault community! -BajaBob

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• Can not input or print Chinese on PuTTY

  - by hetaoblog

  On Red Hat Enterprise Linux AS release 3, I've set my environment variable as below $ echo $LANG zh_CN.UTF-8 $ echo $LANGUAGE zh_CN.UTF-8 $ echo $SUPPORTED en_US.UTF-8:en_US:en:zh_CN.UTF-8 $ locale LANG=zh_CN.UTF-8 LC_CTYPE="zh_CN.UTF-8" LC_NUMERIC="zh_CN.UTF-8" LC_TIME="zh_CN.UTF-8" LC_COLLATE="zh_CN.UTF-8" LC_MONETARY="zh_CN.UTF-8" LC_MESSAGES="zh_CN.UTF-8" LC_PAPER="zh_CN.UTF-8" LC_NAME="zh_CN.UTF-8" LC_ADDRESS="zh_CN.UTF-8" LC_TELEPHONE="zh_CN.UTF-8" LC_MEASUREMENT="zh_CN.UTF-8" LC_IDENTIFICATION="zh_CN.UTF-8" LC_ALL=zh_CN.UTF-8 Meanwhile I've set PuTTY's transmission encoding as utf-8 and appearance-font setting to have a font as 'Fixedsys' which does support chinese. However, when I try to print a file with Chinese, it can not print it correctly $ cat 1.txt hello¦¦¦ $ and I can not input Chinese correctly on shell.

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• Can Acrobat 11 be made to do OCR using multiple CPU cores?

  - by tarcman.

  OCR processing takes time. Using multiple CPU cores would speed up processing. Acrobat 10 was not a multithreaded application. How about Acrobat 11? Does 11 by default do OCR using multiple CPU cores (if available)? If not, are there any workarounds, e.g. scripting, to help make Acrobat 11 do OCR using multiple CPU cores? Either through Acrobat's built in scripting language or using external scripts that launch and direct multiple single thread instances of Acrobat to in parallell to parts of the processing job. Note: This question is not too localized (not limited to a specific moment in time) because (1) Adobe does not release new major Acrobat versions very often (Acrobat 10 was released two years ago) and (2) Adobe Acrobat is a widely used application.

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• Using Zebra LP 2844-Z over the network

  - by Jason Kealey

  Hello, I am looking for a network-based label printer. I am looking at this Zebra LP-2844-Z printer. Unfortunately, it does not come with a network interface like the lower-end LP 2824 Plus. The ZebraNet 10/100 Print Server is both expensive for what it does (~$600) and only seems to support wireless networking, not wired. I prefer wired for reliability. Questions: Can I use a cheaper off-the-shelf print server to turn the LP-2844Z to a network printer. Would I get any trouble communicating with the printer via its own programming language or via OPOS? (instead of the Windows driver) Are cheaper print servers reliable? Would I be better to get another printer model that has it built in directly to avoid having issues due to the print server? What other printer would you recommend?

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• Cannot set MemOpMode or ProcVirtualization with syscfg.exe

  - by EGr

  When attempting to set MemOpMode or ProcVirtualization with syscfg.exe, I get the following error: C:\Users\EGr>syscfg --MemOpMode=AdvEccMode System Services or CSIOR disabled In the past, I have been told that this can be resolved by forcefully reinstalling the Dell Lifecycle controller firmware, and then trying again; however, I cannot find my notes on how to do that. Has anyone ever run into this issue, and does anyone know how I can fix it? If it is possible to forcefully reinstall the firmware, how would I do that? I've tried running the installer, but it fails after running for ~2 min. I believe there is a way to fix this as well, by adding/modifying a registry value at HKLM\System\Control\CurrentControlSet\Services\IPMIDRV (that might not be the correct path, but I know it is IPMIDRV). Is this a common issue? What is the actual cause of it?

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• When to increase AWS RDS MySQL Server instance to larger CPU/RAM?

  - by rksprst

  I'm wondering at what stage do I need to increase the image for the RDS MySQL server to a larger CPU/RAM instance. The CPU utilization graph is near 0. The Avg Free Memory is around 150MB. The Avg Swap Usage is 420MB. Read Latency is 0-20ms/op it spikes up randomly. Avg write latency is on average 5ms/op but spikes up to 10-20ms/op. Are there some common rules here that I should follow? Thanks!

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• What is the purpose of a boot priority sequence or order in BIOS

  - by rbeede

  A BIOS provides multiple options for specifying an order/priority to search for boot devices. Is there really much of a purpose now to have to specify more than one possible boot device? It would seem to me it is only useful when popping in an CD/DVD to install an OS after which the common scenario is to always boot from the hard drive unless something is broken. I'm curious as to why not simply have 1 option/device to set in the BIOS and expect the user to press a key to do alternate boot instead? Is there still a scenario for having the BIOS try multiple devices in a configured order?

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• Error installing nginx with passenger-install-nginx-module on ubuntu 11.10 & rails 3.1.0

  - by user938363

  Here is the error message from installing nginx with passenger-install- nginx-module (rvmsudo). The nginx is 1.0.6 installed under /opt/nginx (default). gem install passenger successfully prior. Someone has idea about the problem? thanks. /usr/bin/ld: /home/dtt/.rvm/gems/ruby-1.9.2-p290/gems/passenger-3.0.9/ ext/nginx/../common/libpassenger_common.a(aggregate.o): undefined reference to symbol 'round@@GLIBC_2.2.5' /usr/bin/ld: note: 'round@@GLIBC_2.2.5' is defined in DSO /usr/lib/gcc/ x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/libm.so so try adding it to the linker command line /usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/libm.so: could not read symbols: Invalid operation collect2: ld returned 1 exit status make[1]: *** [objs/nginx] Error 1 make[1]: Leaving directory `/tmp/root-passenger-2135/nginx-1.0.6' make: *** [build] Error 2 -------------------------------------------- It looks like something went wrong

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• Network - Routers conflicting in my subnet

  - by Richard

  I have a router whose IP is 192.168.1.1 and I be experiencing conflict with another router on my subnet (which probably has 192.168.1.1 as IP too). I think when it tries to connect to the network, eventually taking the place of my router because when I try to access the config page of my router, which appears to me is a config page from another router that is not mine. Do you have any solution except to change the IP of my router to an IP not common? As I have set up the exclusivity that only my IP router? I work with dynamic IPs (wireless networking) and static (for wired). How do I? I just wanna to do some setting in my router that affects all other, so that doesn't conflicts anymore.

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• Asus G53SX How to use the recovery partition

  - by Amento

  I am trying to use the recovery partition on my Asus G53SX laptop, but the instructions in the included booklet don't match up with what happens on the computer. It says press F9 during bootup and then press ENTER to select windows setup. Then select the language you want to recover, and so on. When I press F9 I end up in the boot manager and from there I can access safe mode and all these things. The closest thing I can find in this list is "Repair your computer" but this menu takes me to recovery points and backup images, none which are mentioned in the booklet. How can I use the recovery partition to restore my laptop to factory state?

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• How does ARM Cortex A8 compare with a modern x86 processor

  - by thomasrutter

  I was wondering how does a modern ARM chip based on ARM Cortex A8 compare, in clock-for-clock performance and capability, to a modern x86 chip such as a Core 2 Duo or Core i5? I realise due to the different instruction sets it'll depend heavily on what you're doing. To put it another way, rendering a web page in webkit on a 1GHz ARM Cortex A8 based chip should be about equivalent to doing in on a Core i5 at __ MHz? Update October 2013: Since I asked this question years ago it's become a lot more common, when reading about mobile devices, to see architecture-agnostic benchmarks that you can compare across platforms - for example, in-browser benchmarks like Sunspider in Webkit will run on just about anything and you see these in reviews all the time now. And there's things like Geekbench now.

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• Upgrade MySQL on Plesk on Windows

  - by Cyril Gupta

  I just got a nasty surprise when I installed a website in Unicode Hindi (Indian language) on a server, all freshly entered unicode data is turning into question marks on the server. On my dev machine it works perfectly. I found that I have MySQL version 5.0.45 (installed in default by Plesk I guess). On my dev machine i have version 5.1.33. I believe the problem could be due to the version difference. The new version of MySQL apparently has better support for Unicode than the older one. I want to upgrade MySQL on my Windows Server machine with Plesk installed on it I am reluctant to just install the new version using the mysql installer because Plesk maintains some custom settings for mysql and I am afraid the new version could change those settings and break my db. Can anyone tell me do I have to do anything special to install MySQL on plesk on windows or can I just use the new version installer?

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• Wiping out user and/or root password in embedded linux

  - by TryTryAgain

  We have a security camera system running an embedded linux. It boots with Lilo as a bootloader and has no tty access once booted. I don't know any username either. SSH/22 is open, but I don't think brute force is an option. I have tried all the common tricks to reset a linux user password (boot from the bootloader in single user mode = doesn't happen, still prompts for user login, boot to a live cd = can't access the file system...it's all loop files and other binary, etc etc), but they are all not possible as it is an embedded linux setup the way it is. Any help/suggestions would be appreciated. Thanks

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• What's an easy way to install a bunch of OSS apps in my home dir on my company's aging Redhat VNC servers?

  - by subopt

  My company's IT group doesn't want to install lots of common stuff on our VNC servers, which run RHEL 4. The list of stuff i want/need includes graphviz, midnight commander, various python libs, sqlite, netbeans, antlr, jdk1.6, etc. They've hobbled rpm somehow, so i can't do rpm --relocate. And i don't want the RHEL4 compatible revs of this stuff anyway. I've probably got the room to build all this stuff in my home dir, but i don't want to take forever tracking down dependencies. Looking for an easy way to get the apps/tools i need, and nothing (or very little) else. Any suggestions?

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• Upgrade PHP to 5.3 in Ubuntu Server 8.04 with Plesk 9.5

  - by alcuadrado

  I have a dedicated server with Ubuntu 8.04, and really need to upgrade php to 5.3 version in order to deploy a new version of the system. This version of php is the default one in ubuntu 10.04, so I considered upgrading the OS, but after trying that, I lost my plesk installation, which annoyed my client. I tried adding the dotdeb.org repositories, but don't know why, after running an apt-get upgrade, I get this error: # apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: libapache2-mod-php5 php5 php5-cgi php5-cli php5-common php5-curl php5-gd php5-imap php5-mysql php5-sqlite php5-xsl 0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded. Any idea why is this happenning? Or do you know any alternative method (except compiling my own binaries) to upgrade php or update ubuntu without loosing plesk? Thanks!

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• How do you use environment variables, such as %CommonProgramFiles%, in the PATH and have them recognized by services.exe?

  - by Brad Knowles

  I'm trying to add C:\Program Files\Common Files\xxx\xxx to the system PATH environment variable by appending %CommonProgramFiles%\xxx\xxx to the existing path. After rebooting, I open a command prompt and check the PATH. It expands correctly. However, when using Process Explorer from Sysinternals to view the Environment variables on services.exe, it shows the unexpanded version. Coincidentally, the paths using %SystemRoot% expand and are recognized just fine. I've tried altering the PATH through the Environment Variables window from System Properties and through direct Registry manipulation, neither seems to work. Is it possible to use other environment variables, besides %SystemRoot% in PATH and have services.exe understand it?

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• How do I add missing dictionaries for aspell?

  - by Ahmed

  Aspell version: $ aspell -v @(#) International Ispell Version 3.1.20 (but really Aspell 0.60.6) Dump dict yields no results: $ aspell dump dicts First noticed the problem when I did this, was originally working on web server, but someone updated something and it hasn't worked since: $ aspell check temp_test_file.txt Error: No word lists can be found for the language "en_US". What's the proper way of installing the required dictionaries? I believe we're running this on CentOS. And also, /usr/lib/aspell-0.60 does not contain the required dictionaries (provided that they're supposed to be saved there). data-dir: /usr/lib/aspell-0.60

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• Some people suddenly say they cant access my site, but me and all others can

  - by Cain

  I have had this problem many times before and im still unable to find out what is causing it. It happned to me some months ago but it got fixed by itself and had already gone back to normal. Everything was working fine for quite a while until 2 days ago. Some people are reporting they cant access my site, they get a 404 error, however i can access it normally and many other users cant. I dont know whats the common denominator since both groups of people are from the same countries, use the same browsers, OS, etc. so the issue doesnt seem related to that. I have reported this problem before to my both my host and domain registrar but none of them claim responsibility for that. Who is then to blame? Waht can i do to find out whats causing the issue and solve it? Thank you.

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• Shell Script Launching Child Processes

  - by Matt James

  Disclaimer: I'm totally new to shell scripting, but have quite a bit of experience in other languages like PHP and Obj-C. I'm writing my first daemon script. Here are the goals: I want it to run in the background I want it to be triggered by an init.d script that includes start/stop/restart commands I want each process in a loop to trigger its own subprocess. When the parent process kicked off by the init.d script is killed, I want the subprocesses to die as well. Essentially, I'm looking for the same kind of behavior that appears to be very common among software like apache, spamd, dovecot, etc. But, based on my research, I haven't found a single, simple answer as to how this kind of thing is achieved. Any help is greatly appreciated.

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• Attempting to migrate to Aptana from Dreamweaver - how to?

  - by Kerry

  I have been using Dreamweaver for years, and have used Dreamweaver MX, Dreamweaver MX 2004, Dreamweaver 8 & Dreamweaver CS4. They all carry a common theme and were relatively easy to migrate to each other. I use, however, very few features of dreamweaver. Specifically: Syntax highlighting Telesense FTP management/site management The search/replace The idea I get from Aptana is its much more geared toward the web development/programmer side of things, have better visualizations of classes, etc., and handle everything else just as well. The problem is it is not at all clear to me. I managed to start a new project, but it didn't associate it with an FTP. So, I created an FTP, and it looks like I can have many FTPs for one project. My question then is, is there a tutorial or guide to migrating to Aptana from a Dreamweavor's perspective?

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