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• Rough estimate for speed advantage of SAN-via-fibre to san-via-iSCSI when using VMware vSphere

  - by Dirk Paessler

  We are in the process of setting up two virtualization servers (DELL R710, Dual Quadcore Xeon CPUs at 2.3 Ghz, 48 GB RAM) for VMware VSphere with storage on a SAN (DELL Powervault MD3000i, 10x 500 GB SAS drives, RAID 5) which will be attached via iSCSI on a Gbit Ethernet Switch (DELL Powerconnect 5424, they call it "iSCSI-optimized"). Can anyone give an estimate how much faster a fiber channel based solution would be (or better "feel")? I don't mean the nominal speed advantage, I mean how much faster will virtual machines effectively work? Are we talking twice the speed, five times, 10 times faster? Does it justify the price? PS: We are not talking about heavily used database servers or exchange servers. Most of the virtualized servers run below 3-5% average CPU load.

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• Ubuntu Nvidia Xorg Twinview doesnt like my monitors

  - by Andrew Bolster

  Basically, using the latest available ubuntu drivers (195.36.15) I cannot for the life of me get my two monitors to operate at suitable resolutions. When not using the drivers atall and going single-screen, both monitors support 1680x1050, but this option is only shown for one monitor in nvidia-settings, and when i manually add a metamode into the xorg.conf, it just gives up initialising the second screen. (**) Mar 25 15:49:47 NVIDIA(0): TwinView enabled (II) Mar 25 15:49:47 NVIDIA(0): Assigned Display Devices: CRT-0, CRT-1 (II) Mar 25 15:49:47 NVIDIA(0): Validated modes: (II) Mar 25 15:49:47 NVIDIA(0): "1680x1050,1680x1050" (II) Mar 25 15:49:47 NVIDIA(0): Virtual screen size determined to be 1680 x 1050 Any ideas?

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• Ubuntu Nvidia Xorg Twinview doesnt like my monitors

  - by Andrew Bolster

  Basically, using the latest available ubuntu drivers (195.36.15) I cannot for the life of me get my two monitors to operate at suitable resolutions. When not using the drivers atall and going single-screen, both monitors support 1680x1050, but this option is only shown for one monitor in nvidia-settings, and when i manually add a metamode into the xorg.conf, it just gives up initialising the second screen. (**) Mar 25 15:49:47 NVIDIA(0): TwinView enabled (II) Mar 25 15:49:47 NVIDIA(0): Assigned Display Devices: CRT-0, CRT-1 (II) Mar 25 15:49:47 NVIDIA(0): Validated modes: (II) Mar 25 15:49:47 NVIDIA(0): "1680x1050,1680x1050" (II) Mar 25 15:49:47 NVIDIA(0): Virtual screen size determined to be 1680 x 1050 Any ideas?

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• Need to get a file written to a floppy.

  - by dboarman-FissureStudios

  I asked this question over on SO. I have tried dd if=kernel.sys of=/dev/fd0 bs=512 seek=1 to get this file to write to the floppy. It is a kernel shell that must be written to the sector immediately following the bootsector of a disk to boot the PC. No matter what I've tried, for some reason, kernel.sys is not writing to the floppy. I know the bootstrap loader is being written and executed. However, it cannot find the kernel to load the shell. Any ideas on what I am doing wrong? I mean, really, how is it so difficult to get this file written to a floppy? OpenSUSE 11.2

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• Windows Server 2003 Hacked - Files Being Uploaded

  - by jreedinc

  Blank directories are being created on my Windows Server 2003 virtual server with sub directories that are weird (for example: "88ÿ ÿ ÿÿþþ þþ13þ"). It looks like they are uploading bootlegged DVDs and pirated software. All of my bandwidth and file space is being eaten up. Could this be a shared permissions issue? Where should I look to further investigate this? My security permissions for the directory that is being hit are as followed: Administrators - ALL GRANTED IIS_WPG - Read & Execute, List Folder Contents, Read Internet Guest - DENY SYSTEM - ALL GRANTED Users - Read & Execute, List Folder Contents, Read My Event Viewer is showing many Logon/Logoff with NO IP?

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• Creating hard drive backup images efficiently

  - by Arrieta

  We are in the process of pruning our directories to recuperate some disk space. The 'algorithm' for the pruning/backup process consists of a list of directories and, for each one of them, a set of rules, e.g. 'compress *.bin', 'move *.blah', 'delete *.crap', 'leave *.important'; these rules change from directory to directory but are well known. The compressed and moved files are stored in a temporary file system, burned onto a blue ray, tested within the blue ray, and, finally, deleted from their original locations. I am doing this in Python (basically a walk statement with a dictionary with the rules for each extension in each folder). Do you recommend a better methodology for pruning file systems? How do you do it? We run on Linux.

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• Netinstalling CentOS if the gateway is in a different subnet

  - by James Lawrie

  I have a KVM host (A) running a virtual machine (B). They each have their own external IP address and the networking is setup using bridging between eth0 and br0 on A. B uses eth0, with A being the gateway. The problem is that the two external IP addresses are on different subnets (different /8s in fact) so by default, B claims it cannot reach A (Network Unreachable). I can resolve this by adding a static route on B: echo "any host gateway_ip dev eth0" > /etc/sysconfig/static-routes Modifying /etc/init.d/networking to reload the gateway after applying static routes (I only added the final line before fi): if [ -f /etc/sysconfig/static-routes ]; then grep "^any" /etc/sysconfig/static-routes | while read ignore args ; do /sbin/route add -$args done route add default gw "${GATEWAY}" fi If I then restart networking, it comes online. How can I do this (or work around it some other way) prior to the system being installed, ideally inside an Anaconda kickstart file?

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• Apache Front End....Tomcat back end...SSL question

  - by Jared

  Hi Everyone, Question.... I have Apache setup as my webserver. Tomcat is hooked into Apache via mod_jk, so the user never interacts with Tomcat. I have set up SSL on the Apache Webser...I can hit it with https:// localhost When I try to access my application at ...https://localhost/app I get a directory not found error. Catch is when I go regular http... I can hit it fine... http:// localhost/app What do I have to edit for this connection to work? I have uncommented the AJP connector in server.xml I have added my virtual host to httpd.conf What am I missing? Thanks in advance. Jared

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• How does Amarok rip Audio CDs (in Ubuntu Lucid)?

  - by Hanno Fietz

  I'm in the process of moving my CD collection into my Amarok library. Mostly, it works great. Sometimes however, the process just hangs forever. The problem seems to occur at random (i. e. often, but not always at the same disk/track) and the consequences range from none (successful after cancel/retry) to Amarok's internal db becoming completely messed up. I would like to investigate and file a proper bug report or find a fix / workaround, but I don't understand how Amarok does the ripping. When all is working, there's a lame process encoding to a temporary file, which appears in my collection once it's finished. When the process hangs, that lame command is still there, but waiting forever for data on stdin, which seems to come from a third process. That seems to be kio_audiocd, but I don't know whether that's correct and what it's supposed to do. What's going on?

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• router w/ WOL out-of-the-box, or is known to work with open firmware

  - by Jaroslav Záruba

  I'm looking for a new WiFi router, and one key feature for me is WOL. Seems like many routers won't do this w/ factory firmware. Given my last router (Asus WL-520g) turned into a disco-brick couple hours after flashed to dd-wrt I'd prefer if the new one supported WOL out-of-the-box. other required features would be: dyndns service support port forwarding sometimes it is called "virtual server" I guess NAT loopback so I can access services running in my own network using dyndns hostname or public IP w/o getting too old (for example DIR-615 with factory firmware lets you wait literally minutes) did I mention WiFi? preferably w/ some range extending technology, if such stuff works at all

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• Help creating image from LVM

  - by jackhab

  I need to duplicate CentOS hard drive image for multiple stations. The HD has the following layout: Disk /dev/sdb: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 250GB 250GB primary lvm I saved /dev/sdb1 to file with fsarchiver but for sdb2 I get: /fsarchiver savefs an2.fsa /dev/sdb2 oper_save.c#1006,filesystem_mount_partition(): can't detect and mount filesystem of partition [/dev/sdb2], cannot continue. removed an2.fsa Although fsarchiver probe simple correctly detects sdb2 as LVM2_member. Is fsarchiver correct tool for this job? What's wrong? I'm on Ubuntu 9.1 with fsarchiver 0.6.8 and lvm tools installed. Thanks.

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• Help creating image from LVM

  - by jackhab

  I need to duplicate CentOS hard drive image for multiple stations. The HD has the following layout: Disk /dev/sdb: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 250GB 250GB primary lvm I saved /dev/sdb1 to file with fsarchiver but for sdb2 I get: /fsarchiver savefs an2.fsa /dev/sdb2 oper_save.c#1006,filesystem_mount_partition(): can't detect and mount filesystem of partition [/dev/sdb2], cannot continue. removed an2.fsa Although fsarchiver probe simple correctly detects sdb2 as LVM2_member. Is fsarchiver correct tool for this job? What's wrong? I'm on Ubuntu 9.1 with fsarchiver 0.6.8 and lvm tools installed. Thanks.

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• Web clipping / note taking software on Linux

  - by bguiz

  Hi, I use this great web-clipping and note taking app called Evernote on my Windows machine. However, there's no Linux version of Evernote (doesn't work properly in Wine). I would like to get some suggestions for something with similar capabilities that runs on Linux/Ubuntu. Specifically I need to be able to select parts of a web page in Firefox, and press some key combination, to save that clip to disk, in some sort of searchable database The clip needs to have pictures and basic text formatting, anything extra is unnecessary I also need to be able to create empty note or edit existing one. Storing the notes on a local machine only is fine - I don't need the sync features of Evernote

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• Database checksum features - redundant? useful?

  - by Eloff

  Just about every mainstream DB has a feature to calculate checksums per page, per sector, or per record. Now for a DB that does full recover after any crash, like PostgreSQL, is a checksum even useful? There will be no data loss as long as the xlog is ok, no matter what kind of corruption happened to the data itself, as the redo log is replayed every committed transaction will be restored. So checksums are useless on restore. Doesn't the filesystem or disk keep checksums anyway to detect corruption? So unless the checksum is per record, all it does is tell you there is corruption - which the OS should be yelling at you the minute you try to read it - so useless in operation? I can't imagine how a checksum can be helpful in any sane database - but since they all use them - I'd say that's just failure of imagination on my part. So how is it useful?

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• Regarding compatibility of Intel Pentium D 805 CPU with new motherboard

  - by aniruddhabhide

  I currently have an old configuration with Intel Pentium D 805 CPU and Intel D101GGC chipset. Now I am planning to upgrade my system except CPU and hard disk since it doesn't fit in the budget. QUESTION: I am planning to get Gigabyte GA-B75M-D3H Motherboard which has LGA1155 socket. But my processor has PLGA775 socket type. Will my CPU fit in thee new motherboard's socket? LINKS: CPU specs (Intel site): http://ark.intel.com/products/27511/Intel-Pentium-D-Processor-805-2M-Cache-2_66-GHz-533-MHz-FSB New Motherboard specs (Vendor site): http://www.flipkart.com/gigabyte-ga-b75m-d3h-motherboard/p/itmdacp36gegyeqt?pid=MBDDACP2GUBGFPFM

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• What should we be aware of when moving windows servers to another domain

  - by Klaus Byskov Hoffmann

  Hi everyone, We have a bunch of (virtual vmware) windows servers (2003 and 2008) that our hosting provider wants to move to a new domain. They also want to rename the servers. The hosting provider is in charge of maintaining the servers, while we are in charge of making sure that all our business applications are working. Our business applications include custom developed .net applications using such things as SQLServer 2008, TFS 2010, asp.net, some legacy COM+ apps, etc. To be honest I don't feel too convinced that this migration will be as painless as the hosting provider wants to make it sound. I would greatly appreciate any input on what we should be aware of when discussing the practicalities involved in the migration with the hosting provider. Thanks in advance. Klaus

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• Sharing an external hard drive in Ubuntu using Samba

  - by cambraca

  /media/MYDISK is where my hard drive is mounted automatically. I created a symlink using: ln -s /media/MYDISK /home/camilo/MYDISK chmod 777 /home/camilo/MYDISK I'm setting up smb.conf like this: [myshare1] comment = external disk browsable = yes path = /home/camilo/MYDISK guest ok = yes read only = no create mask = 0775 Also, in the [global] section I tried adding the following lines: follow symlinks = yes wide links = yes unix extensions = no The problem is that when browsing the shared folder in Windows 7, I get a "\\etc\myshare1 is not accessible" error. When pointing the path to a regular folder it works fine. Also, when I point it directly to /media/MYDISK, it shows the same error. EDIT: to make it more interesting, I have no graphical interface, so I need to touch the config files directly..

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• Recommended Configuration to setup Tomcat 7 on windows OS

  - by yashbinani

  I have created a small web application using java/jee which will be deployed in LAN environment. I want to know the recommended hardware configuration. Details are as follows 1) Expected number of hits: 20 hits / hour 2) Number of clients 5-7 3) Application Server : Tomcat 7 4) Database server : MySql App and DB shall be deployed on same machine 5) OS Configuration : Windows XP or any unix flavour ? Can a simple p4/celeron machine with 1 gb ram 8-10 GB hard disk will be sufficient to cater client requests? Server will not be storing too many files/images/videos Client does not want to spend too much on infrastructure.

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• OS X Lion - Installing Oracle 10g Standard Edition

  - by Cellze

  Im trying to install oracle 10g on to OS X Lion, I have previous achieved this on snow leopard with the following http://blog.rayapps.com/2009/09/14/how-to-install-oracle-database-10g-on-mac-os-x-snow-leopard/ The issue im having is that the ulimit settings in the oracle/.bash_profile cannot be modified. I have the following in the bash_profile: export DISPLAY=:0.0 export ORACLE_BASE=$HOME umask 022 # must match `sysctl kern.maxprocperuid` ulimit -Hu 512 ulimit -Su 512 # must match `sysctl kern.maxfilesperproc` ulimit -Hn 10240 ulimit -Sn 10240 Upon applying the bash_profile settings . ~/.bash_profile i get the following error: -bash: ulimit: max user processes: cannot be modify limit: Invalid argument This then results in $ sqlplus / as sysdba not functioning correctly with a Segmentation fault: 11 The output of $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 10240 pipe size (512 bytes, -p) 1 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 512 virtual memory (kbytes, -v) unlimited If any one knows how I can apply these ulimit settings to the oracle user I have created to allow me to install sqlplus and therefore create a db, that would be great.

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• What is good book for administration & configuration of Storage logical arrays?

  - by unknown (yahoo)

  I am looking for a book which can explain pros and cons of different combination of configurations/policies of storage Arrays and may also suggest some best practices for certain scenarios for e.g. when data availability & security is very important. There are a lot of "books for dummy" but they don't go in depth, I am a more of developer so I would like to understand how and why exactly it works beneath policies & configuration settings. I am working with EMC clarion logical array but I will have to work with EMC Symmetrix or NetApp or any other types of disk arrays.

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• How to do simple multitasked loop processing over filenames with PowerShell?

  - by Ville Koskinen

  I'm batch transcoding some 50 GB of video files on a USB hard disk which is connected to a wlan router. The drive is mapped as a network drive on my Windows 7 laptop. The speed handicap of the wlan causes some parts of the processing to become unnecessarily slow, so I would like to do the following with PowerShell: List the names of the files on the network drive to be transcoded Copy the first file to a temporary folder on my laptop Simultaneously Transcode the file in the folder Begin copying the next file from the network drive to the temporary folder After transcoding and copy have both ended, Delete the file which has been transcoded from the temporary folder Begin transcoding next file in the temporary folder Loop until all files have been processed How would I be able to do this with PowerShell? The multitasking part is an obstacle for my skill/persistence combination.

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• Recommended CPU upgrade for Dell Vostro 220 with Intel E7300 processor?

  - by Justin Grant

  I've got a Dell Vostro 220 with an E7300 processor (Intel Core 2 Duo @ 2.66Mhz, LGA775 socket) and I'm thinking about upgrading my processor so I can run Windows Server 2008 R2 with Hyper-V, which requires Hardware Virtualization support in the processor. Yes, I know this is underpowered for a server, I'm actually using it as a desktop machine but I'd like to use Hyper-V instead of Virtual Server (which I'm using now for running VMs). I'd like to keep the same motherboard and ideally the same CPU fan and RAM too. Any suggestions for a good, relatively cheap (under $200) processor upgrade?

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• Should I replace libapache2-mod-php5-filter with libapache2-mod-php5 on Debian 6 Apache 2.2.16?

  - by luison

  Upgrading various virtual machines we are having an issue with the Debian package upgrade to version 2.2.16 The upgrade (surprisingly) seems to remove libapache2-mod-php5 replacing it with libapache2-mod-php5-filter. This gave us some headache as the php.ini was pointing to the "old" one and some of the apache.conf conditional module rules stopped working. We can fix all those but we can't figure out if there would be any issues if we just "reversed" this and simply install libapache2-mod-php5 again and load that module instead of the "filter" one or in there is anyway to "alias" a module. I tend to think that the change "has a reason" but after reading apache2 and php5: module or filter I understand the module differences are to do with post delivery security issues.

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• Dell V105 and 10.6

  - by James

  Hello, I am trying to get a Dell V105 printer to work with my iMac. It is running 10.6 and I have installed all the drivers on the Snow Leopard disk. I believe there is no official Dell driver but I have also heard the Dell printers are made by third parties that may sell the same printer under different names. There a quite a few Lexmark models that seem to look very similar and I have tried setting the driver to the 2600 series that looks very similar but that has not enabled me to print. Although it claims to give me the supply levels correctly. Can anyone help? Thanks for your time

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• Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)

  - by snitko

  I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx. Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too. Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output: $ iostat avg-cpu: %user %nice %system %iowait %steal %idle 0.17 0.00 0.02 0.57 0.16 99.07 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvda 2.25 39.50 16.08 147042 59856 xvdb 0.00 0.05 0.00 192 0 xvdc 2.20 25.93 24.93 96530 92808 xvdd 0.01 0.12 0.00 434 16 xvde 0.04 0.23 0.35 858 1304 xvdf 0.37 0.31 4.12 1162 15352 Rebooting didn't help either. Any ideas where should I be looking?

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