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• Linux IO scheduler on databases with RAID

  - by Raghu

  Hi, I have a linux database(MySQL) server(Dell 2950) with a 6-disk RAID 10. The default IO scheduler on it is CFQ. However, from what I have read and heard, there is no need for a scheduler like CFQ when reordering/scheduling is also done by underlying RAID controller; on the contrary since it does not account underlying RAID configuration into account performance may actually degrade with CFQ. The primary concern is to reduce CPU usage and improve throughput. Also, I have seen recommendations of using noop/deadline IO scheduler for databases primarily because of the nature of their R/W access.

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• C drive should only contain OS. Myth or fact?

  - by Fasih Khatib

  So, I have a 500GB HDD @7200RPM. It is split as: C: 97GB D: 179GB E: 188GB My belief is to keep OS ONLY in C:\ and any adamant programs that won't go anywhere apart from C:\ [because this speeds up the PC during startup process] and install programs in D:\ so that in case I have to reinstall the OS, I will have the programs readily available after reinstall. But I have begun to think this approach is flawed because if C:\ is formatted, I will lose registry values and stuff that goes in %appdata% and so it is no use keeping programs in D:/ drive because they will be useless after all. Should I go ahead and install ALL of my programs in C:\ and then use D:\ and E:\ for storing my data like photos, text files, java files n all? How will this impact the performance of the HDD? I only have 3 programs in D:\Program Files so it will be easy to reinstall them :)

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• My NTFS Partition keeps becoming "unusable" on Ubuntu, Any Ideas?

  - by gopherman

  I just purchased a new 2TB Drive External Seagate, My main system uses both Windows and Ubuntu So I am pretty much stuck with keeping my drive as NTFS. I have done this without any problems before but since I got this new drive I have been having issues. When I first load up Ubuntu the drive mounts and runs fine, after an unspecified amount of time i start getting Input/Output errors when accessing the drive. When I goto the Disk Utility I get a message stating the drive is "Unknown or Unused", If I disconnect and reconnect the drive or reboot everything is fine again. There's no errors coming up with S.M.A.R.T and it seems to work fine while under windows. Any thoughts?

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• My NTFS Partition keeps becoming "unusable" on Ubuntu, Any Ideas?

  - by gopherman

  I just purchased a new 2TB Drive External Seagate, My main system uses both Windows and Ubuntu So I am pretty much stuck with keeping my drive as NTFS. I have done this without any problems before but since I got this new drive I have been having issues. When I first load up Ubuntu the drive mounts and runs fine, after an unspecified amount of time i start getting Input/Output errors when accessing the drive. When I goto the Disk Utility I get a message stating the drive is "Unknown or Unused", If I disconnect and reconnect the drive or reboot everything is fine again. There's no errors coming up with S.M.A.R.T and it seems to work fine while under windows. Any thoughts?

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• Just how slow should my VPN be?

  - by David Heggie

  I have a VPN setup between a remote office with 2 ADSL connections (8Mb downstream, 512Kb upstream) and a main office with a 10Mb EFM connection (10Mb both up and down). The VPN is an IPSec connection using a DrayTek 2930 router for the ADSL and a DrayTek 3200 router at the EFM end. However, I'm unable to get speeds over this connection (tested with iperf) of anything over 600Kb or so down from the main office (traffic will pretty much always be from the main office to the remote office) Whilst I realise that there is an overhead and I'm never going to get the "full" bandwidth available over this VPN, I'd like to think that there's something I should be looking at that may help improve it. I've tried using the DrayTek's built-in "VPN Trunking" features which are supposed to load-balance connections, but this doesn't seem to improve matters much. I guess my question is - is this the kind of performance I should expect from this kind of setup and I'll just have to live with it, or should I be able to squeeze something more out of it through some VPN magic?

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• Using iTunes within Terminal Services 2008 R2 - Pitfalls etc

  - by Kristiaan

  I was hoping to get some further information on any possible Do's and Don't when it comes to installing, using and maintaining iTunes within a Termina Server environment. We have come across a situation in our company whereby some of our users who are using thin clients now need the ability to sync, update and manage their devices, previously they used either standard desktop systems or laptops so there was no issue with running iTunes. I have not found much information on the web about using iTunes within a Terminal Server Farm, Id like to find out if iTunes works within the environment, any known or common issues that occur due to running it like this.

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• What is the Optimal Server Configuration for Split-Path Testing?

  - by doug

  I am far from an expert on Apache or any server for that matter, so i apologize if this question is poorly worded, which it likely is. We have always relied on a vendor for split-path testing (aka "AB Testing"). If you're not familiar with that term, it's a form of marketing research in which you slightly modify one of your web pages (usually one nearest the point of conversion), say for instance, by changing the position of the "Buy Now" button or its color/contrast/texture, then serving one of those two pages to a given user based on random selection. By doing split-path testing ourselves, I suspect we can do it far more cheaply and increase cycle times as well. What is the optimal set-up for these tests? "Optimal" is based on the following criteria: how quickly/easily new tests can be set-up and put online; and minimal disruption to overall site performance

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• Computer temporarily freezes and then resumes

  - by trizicus

  This happens on ALL operating systems (7, Ubuntu, etc.). What happens is everything for 1-3 seconds becomes unresponsive, I then hear what sounds like my other internal hard drive 'spinning up', and then viola everything is responsive again. Note: Already ran SMART tests, no issues at all. I think issue is that the HDD spins down and when need it gets 'turned-on' (OS settings turn off HDD's after 20 mins of inactivity) and because my pagefile is on the other HDD it causes OS to temporarily freeze. Need more tips, and insight. Thanks More info: Running Quad CPU, 4GB RAM, Intel SSD, GT 240.

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• Fonts not found when print request comes from a child process of a Service

  - by beeglebug

  I have a strange issue on a Windows Server 2003 box which has been baffling me for days now. I have a service running on the machine which calls a specified exe every 60 seconds, the exe looks at a local database to see if it needs to print anything, and if so, it prints it to a network laser printer. The problem i'm having is that some fonts won't print out when the exe is called automatically by the service, but work fine if I double click the exe to run it. The font was installed by Administrator, but the service runs as NT Authority\System. I thought this might have something to do with it, but I tried running the service as Administrator, and that didn't solve it. Are there any issues with fonts and permissions that i'm not aware of that could be causing this behaviour?

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• Utility to listen on port (Windows 2003 Server)

  - by Gero

  Hi, I need to validate some network connectivity from machine X to a Windows 2003 Server machine. To be able to do so I'm looking for a simple utility that I can run on the Windows 2003 server that will listen on a specified port. It does not have to do anything else. When it listens on the specified port I can do a telnet to that port from machine X and check if all firewalls are open. The Windows 2003 Server machine is already a production machine so I cannot install all kinds of stuff. At this stage we want to ensure that all network connectivity is in place before we do the installation of the 'real' application that will listen that port (don't want to wast time debugging network connectivity issues when we do the actual deployment of the new application. The utility should be a simple command line utility that does not require any installation. What utilities do you recommend? Thanks, Gero

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• Storage replication/mirror over WAN

  - by galitz

  Hello, We are looking at storage replication between two data centers (600km apart) to support an active-passive cluster design for disaster recovery. The OS layer will be mostly Windows Server 2003/2008 with some OpenSuSE Linux used for performance monitoring on VMWare or possibly XenServer. The primary application service to replicate is Nvision. Datacenter 1 will have two storage systems for local active-passive or perhaps active-active replication with Datacenter 2 used as a last resport disaster recovery site. We have a handle on most aspects, but I am looking for specific recommendations on storage platforms that can handle remote replication cleanly. Thanks.

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• remove apache tar binary package in centos

  - by user119720

  I need help in removing binary package that had been installed in my linux machine. The scenario that I am having are such as like this: I've already install latest apache that I get from its website(httpd.apache.org) through Unix binary package(tar.gz) After successfully install program,the apache server web perfectly without any issues. But then I having a thought,if there are another latest release version of apache in the future,then I need to make sure that i can upgrading current apache or reinstalling the new version apache. So my question is, how do I ensure that I have remove the old remove apache and all its dependencies so that it will not having conflict(probably) when installing the new apache. Right now the only thing that i can think of is to remove all the apache folder manually : rm -rf /apache2 Hope someone can shed some light about this.Thanks.

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• Outlook 2010 intermittently going offline

  - by BarmyArmy

  Just a quick question to see if anyone can give me any direction in or solve the the following problem: Within the office there are a minority who use Outlook client using IMAP and the rest use Thunderbird on Linux. The people who are using Outlook 2010 are repeated (almost daily) reporting outages of emailing services for hours at a time forcing them to sign in and out etc but the people using Thunderbird do not have any issues what so ever which I assume will rule out an issue with the old mail server we are currently using. Any help in the matter would be hugely appreciated and of course if I can provide any further information to articulate understanding of the issue then please just ask. Thanks!

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• How can I perform a ping every X minuts and check the response time?

  - by Profete162

  I am currently working in a big company and we have serious latency issues. This is happening in a process control system, and is unacceptable (Open a valve sometimes take 2 minuts before command start) The Network team seems very lazy and I want to check when they say "everything alright on the network". So, I want to create a loop that ping the server and write the result in a text file. I am not a batch expert, but do you think this code is correct to use? @ECHO OFF :LOOPSTART time /T ping xxx.xx.x.x -t >> filename.txt sleep -m 3000 GOTO LOOPSTART

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• Windows XP Pro 'Connect to' logon box greyed out with Guest

  - by HaydnWVN

  Have a machine i've just nuked and paved to be used in a public enviroment, yet still connected to a Workgroup. Would like it to prompt for a logon when accessing any of the network shares as different departments will be using it. It does prompt for a login but the username field is greyed out. Have disabled simple file sharing, disabled guest account, changed Local Security Policies (Network access Sharing and Security model to 'classic') all to no avail. A google around has lots of other people with the same issues, lots of 'fixes' with very few feedback. Of course none of these work for me! :)

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• How do we increase the maximum allowed HTTP GET query length in Jetty?

  - by Mike

  We are using Jetty to run an Apache Solr index. We've had some queries that have grown way beyond the previously expected maximum length, and are now having issues wehre most queries are not returning any data because the URL gets truncated. These requests are not being made through a browser, they're being made programmatically using the Apache_Solr_Service PHP library. The application is expecting queries to come in as HTTP GET requests, so simply switching to a POST will not solve this problem. How can we increase the maximum allowed HTTP GET query length in Jetty? Thanks!

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• Verizon Fivespot firewall

  - by Patrick

  I have a Verizon Fivespot Wi-Fi router and am having issues connecting to the computer that uses it to get on the internet. I am able to connect to the Fivespot admin pages remotely and I am able to connect to the internet from the computer behind the Fivespot. There are two sections pertinent to this issue, Port Filtering And, Port Forwarding I've tried each individually and both together but cannot access anything through the router except for the admin page. I am trying to connect through SSH to an Ubuntu 10.04 box over wifi. I have called Verizon Tech Support but they were unhelpful, the person essentially read what it says on each screen without any elaboration. Any help is greatly appreciated!

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• NVIDIA Driver Crashing on Custom-Built Windows 7 PC

  - by srunni

  I've got a custom-built PC with these specs: Fractal Design Define R3 ASUS P8Z77-V motherboard Intel Core i7-2700k with Thermalright HR-02 Macho Cooler NVIDIA GeForce GTX 560 with Arctic Cooling Accelero Twin Turbo II Cooler Crucial M4 128 GB SSD 1 TB Hitachi HDD G.SKILL Ares Series 2x8 GB RAM (x2) SeaSonic 520W PSU Windows 7 Ultimate SP1 (x64) NVIDIA driver version 301.42 Upon building the PC, I overclocked the CPU (but never the GPU), and there were no problems for 1-2 months. Then I started getting crashes with this error when doing anything that's computationally or graphically intensive: I un-overclocked the CPU, but that hasn't fixed anything. This is what the inside of my case looks like: I'd appreciate any guidance on resolving this problem. I did get some of the thermal paste on the graphics card when installing the aftermarket cooler, but there were no issues for a month or two. Update I did a clean install and the issue persisted - looks like it's a hardware issue. I will try removing/cleaning/reseating all the parts.

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• Windows 2008 x64 displays SP1 when SP2 is installed

  - by Graham Powell

  After setting up a Windows 2008 x64 server (not R2), I installed a number of Microsoft updates. After installing these updates, the computer reports that it has SP1 installed, not SP2. I believe the culprit is KB917607, which allows Windows 2008 to display .hlp files. Now I have to upgrade Internet Explorer on this server, and it won't install without SP2. I am very leery about reinstalling SP2, as I have installed a large number of post-SP2 updates, and I've had issues after reinstalling SP2 in similar circumstances. How can I fix Windows so it reports the correct service pack?

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• Distribute Nagios to reduce false alarms

  - by GDR

  I'm currently running a single Nagios instance. From time to time, I'm getting false alarms about timeouts - for example, it says that HTTP is down on some server, but when I open it in my browser several seconds later, it loads fast, and in general there is no trace of an error. What can I do to reduce such false alarms? I'm guessing that it's because of transient network issues on my monitoring server. I guess that setting up another monitoring server on a different network would greatly help, but how do I plug it into Nagios? Is it at all possible with Nagios or do I have to switch to another monitoring system? I like my configs and, if possible, I'd like to stay with Nagios or something compatible (Icinga?)

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• Forgot to unmount/eject external hard drive, lost moved files. Mac OS X

  - by balupton

  So I was using my Mac with my external hard drive connected via USB. I moved about 10 GB of data to it (via drag and drop while holding down the Command key to move the files rather than to copy them). They moved to the drive all right, but as I was having some issues and the Finder crashed after the transfer, I was unable to eject the volume and later everything froze so I had to do a hard restart (hold the power button). When I remounted the volume (plugged the external hard drive back in) it no longer had any of the files which I moved onto it. As it was a lot of data, how can I recover these files?

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• Windows 7 Natively on Mac OS X Bootcamp, Airport Wifi Unable To Connect

  - by Goober

  I am using a brand new MacBook Pro. I am running a copy of Windows 7 natively via bootcamp (No use of Virtual Machine Software at all). However the only way I can get Windows to connect to the internet is via ethernet, as opposed to the Macs Airport card picking up the wireless. It just refuses to connect, and gives me a limited access status. Any ideas!? I've run Windows XP natively via bootcamp and I had a few issues with the network constantly dropping out, however I blamed that on the drivers and the general shiteness of XP.... Help greatly appreciated.

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• Finding Locked Out Users

  - by Bart Silverstrim

  Active Directory up to 2008 network (our servers are a mix of 2008, 2003...) I'm looking for a quick way to query AD to find out what users are locked out, preferably from a batch or script file, to monitor for possible issues with either user accounts being attacked by an automated attack or just anomalies in the network. I've Googled and my Google-fu has failed; I found a query off Microsoft's own knowledgebase that cites a string to use on Server 2003 with the management snap-in's saved queries (http://support.microsoft.com/kb/555131) but when I entered it, the query returned 400 users that a spot-check showed did NOT have a checkmark in the "Account is locked out" box under "account." In fact, I don't see anything wrong with their accounts. Is there a simple utility (wisesoft bulkadusers apparently uses this method behind the scenes, since it's results were also wrong) that will give a count of users and possibly their user object names? Script? Something?

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• Do I need more RAM for programming if I switch to a 64 Bit OS?

  - by Buttercup

  Hi, Given that today (for performance reasons?) variables are usually aligned to the "bit-width" (I wanted to use "word-width" here, but on x86 a "word" is still 16 bits right?) of the processor, would switching from a 32 bit OS to its 64 bit version double the RAM usage? Would this then in turn mean that to do the same work a 32 bit OS can do with 4 GB RAM (well, the 3.x GB actually...) with a 64 bit OS I would need 8 GB of RAM for programming? Please note that I'm only talking about everyday x86 computers here.

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• Installing VirtIO drivers in Windows Server 2008

  - by Stefan K.

  We are running a Windows Server 2008 system as a "guest" on a Linux-KVM virtual server (SLES11, with VirtIO support). We have trouble with the system performance and this is possibly due to not using the VirtIO drivers. I don't have much experience with neither KVM not VirtIO. Just heard it this could be the reason for our problem. Questions: The install examples I just found are describing how to install the drivers during Windows setup. Is it possible to install the VirtIO drivers later? We have running software on that system and would like to avoid reinstalling/setup of all these. I already found a page describing how to sign the drivers, which seems to be needed. A good tutorial page (step by step instructions) would be nice. Is there anything like that out there?

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