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• RAID 50 24Port Fast Writes Slow Reads - Ubuntu

  - by James

  What is going on here?! I am baffled. serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo dd if=/dev/zero of=/Volumes/MercuryInternal/test/test.fs bs=4096k count=10000 10000+0 records in 10000+0 records out 41943040000 bytes (42 GB) copied, 57.0948 s, 735 MB/s serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo dd if=/Volumes/MercuryInternal/test/test.fs of=/dev/null bs=4096k count=10000 10000+0 records in 10000+0 records out 41943040000 bytes (42 GB) copied, 116.189 s, 361 MB/s OF NOTE: My RAID50 is 3 sets of 8 disks. - This might not be the best config for SPEED. OS: Ubuntu 12.04.1 x64 Hardware Raid: RocketRaid 2782 - 24 Port Controller HardDriveType: Seagate Barracuda ES.2 1TB Drivers: v1.1 Open Source Linux Drivers. So 24 x 1TB drives, partitioned using parted. Filesystem is ext4. I/O scheduler WAS noop but have changed it to deadline with no seemingly performance benefit/cost. serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo gdisk -l /dev/sdb GPT fdisk (gdisk) version 0.8.1 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Disk /dev/sdb: 41020686336 sectors, 19.1 TiB Logical sector size: 512 bytes Disk identifier (GUID): 95045EC6-6EAF-4072-9969-AC46A32E38C8 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 41020686302 Partitions will be aligned on 2048-sector boundaries Total free space is 5062589 sectors (2.4 GiB) Number Start (sector) End (sector) Size Code Name 1 2048 41015625727 19.1 TiB 0700 primary To me this should be working fine. I can't think of anything that would be causing this other then fundamental driver errors? I can't seem to get much/if any higher then the 361MB a second, is this hitting the "SATA2" link speed, which it shouldn't given it is a PCIe2.0 card. Or maybe some cacheing quirk - I do have Write Back enabled. Does anyone have any suggestions? Tests for me to perform? Or if you require more information, I am happy to provide it! This is a video fileserver for editing machines, so we have a preference for FAST reads over writes. I was just expected more from RAID 50 and 24 drives together... EDIT: (hdparm results) serveradmin@FILESERVER:/Volumes/MercuryInternal$ sudo hdparm -Tt /dev/sdb /dev/sdb: Timing cached reads: 17458 MB in 2.00 seconds = 8735.50 MB/sec Timing buffered disk reads: 884 MB in 3.00 seconds = 294.32 MB/sec EDIT2: (config details) Also, I am using a RAID block size of 256K. I was told a larger block size is better for larger (in my case large video) files. EDIT3: (Bonnie++ Results. Would love some guidance with this!)

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• My router often reboots in high-load conditions, how to fix?

  - by Ben Baril

  Hi all, I have a Linksys wrt54g v8 with DD-WRT micro installed. I find in high load situations (downloading a torrent for example) the router will simply restart several times. Any ideas what's wrong? Should I revert to the stock firmware?

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• Display date difference in MS Word

  - by serhio

  I have an CV and would like to automatically update my age when opening. So, what formula should I insert in a MS Word field? Something like { CREATEDATE \@ "01/01/1983" - CREATEDATE \@ "dd/MM/YYYY"} ?

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• How to install grub into an .img file?

  - by Francesco Turco

  I did the following: created an empty .img file with dd associated it to /dev/loop0 with losetup created a partition in it with fdisk formatted such partition with mke2fs copied a custom GNU/Linux system into that partition Now I'd like to make the .img file bootable by installing grub into its MBR and /boot directory. My goal is to load the .img file with qemu. It would be better if grub2 is used instead of grub legacy. Thanks.

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• Router with Wake On LAN

  - 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 DD-WRT I'd prefer if the new one supported WOL (Wake on LAN) out of the box. Other required features would be: DynDNS service support Port forwarding 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)

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• Match Hard Dusk Partition Table?

  - by MA1

  Hi All What is the efficient way to match the two different hard disk partition tables? I have save the partition tables using dd command in linux. The partition tables are from Windows system. Regards,

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• CPU on ubuntu goes crazy

  - by n179911

  Hi, I am running ubuntu 9.10. At the sudden the CPU goes crazy and when I do top, it is used by a command called 'dd' and it is run by USER 'root'. It keeps going to for 15 minutes. Can you please tell what is it doing? and if I can kill it by reboot my machine? Thank you.

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• External hard drive no detected in a vista ultimate

  - by raghavendra

  Hi, I have created a partition in my external HD and later i am trying to install XP over Vista . So i have entered into my DOS prompt and i choose the DISK TYPE and i choose external DD and i tried to CLEAN it , Immediately my external HD is asked for FORMAT and i rejected it . After that i restarted my system , therefore i cannot able to see my external HD on my sysmen External HD: Seagate Free agent(500GB)

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• Creating a USB stick for installing centos 6.x using DVD1 and DVD2 iso files

  - by user250563

  First, we create 2 partitions on the USB stick that is let's say 16GB. first partition is let's say only 1GB and the second partition is the rest of what is available. after we "w" write the changes, the USB now has 2 partitions. 1 is 1GB 1 is more than 14GB so , we have... sdb1 and sdb2 now. now we need to turn these partitions into filesystems some say i should run these commands after those procedures. mkfs.vfat -F 32 /dev/sdb1 mkfs.ext3 /dev/sdb2 but some web pages recommend using: mkfs.vfat -n BOOT /dev/sdb1 mkfs.ext2 -m 0 -b 4096 -L DATA /dev/sdb2 which is it? so let's say the DVDs are called: CentOS-6.4-x86_64-bin-DVD1.iso CentOS-6.4-x86_64-bin-DVD2.iso so we make a directory: mkdir -p /mnt/dvd1 and then mount it: mount -o loop CentOS-6.4-x86_64-bin-DVD1.iso /mnt/dvd1 and i suppose we don't make a directory for dvd2 and we don't have to mount it ? at this point i do not know what should be done. but i think this step might be next: we make the USB bootable by finding the file named mbr.bin and then moving it to there via these commnad. dd conv=notrunc bs=440 count=1 if=/usr/lib/syslinux/mbr.bin of=/dev/sdb parted /dev/sdb set 1 boot on in other words we are "dd-ing it to 'sdb' not sdb1' or 'sdb2'. and then we use parted to set the boot to on for sdb so far everything looks good? here is the confusing parts.. how exactly do i move these iso files to the usb drive? EVERYTHING BELOW IS A GUESS. so at this point i should copy the folder /mnt/dvd1/isolinux to usb's sdb1 or sdb2 ? rename it to syslinux ? and then inside this syslinux folder there will be a file called... isolinux.cfg ? which should be renamed to syslinux.cfg ? and then copy the contents of /mnt/dvd1/images/* to USB's sdb2 ? but i think i am also suppose to copy and paste the both CentOS-6.4-x86_64-bin-DVD1.iso CentOS-6.4-x86_64-bin-DVD2.iso somewhere into this USB's sdb2 partition, correct ? almost like a drag and drop kind of a thing? or do they go into any folders ? centos' own web site has some instructions but those instructions do not work. http://wiki.centos.org/HowTos/InstallFromUSBkey i once got this working but things got ruined, i have to do it again and this time take notes.

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• How do I delete the next line in vim?

  - by Jason Baker

  In emacs, whenever I want to delete a few lines of text, I just use C-k until all the text is gone. However, in vim it seems a bit more complex. I know I can do d$ to delete until the end of the line and dd to delete the entire line I'm on, but how do I delete all of the next line?

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• How to clone or copy running windows 7 to child partition

  - by saad

  Is there anyway to clone partition to partition in windows 7 for free using some kind of command line tool so that i can set block size to increase speed i google and found some tools like dd for windows and dcfldd but when i use them it gives me error like access denied and permission denied i tried to login as administrator using: net user administrator on but its same problem dcfldd bs=4096 if=.\k: of=\.\m: while its working to create image file : dcfldd bs=4096 if=.\k: of=\.\M:\filename.ext some help needed on this will appreciate thanks

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• does log4net AdoNetAppender support sql server 2008?

  - by schrodinger's code

  my config file below: very strange, i have spent a day to find out where i am wrong, but still not working, it still not log anything in the database,but i can output them using RollingFileAppender. Also, the store procedure WriteLog is working well.(I have tested it using sql server studio). I have tried to change the connectionType but not working. Unfortunately I dont have sql server 2000/2005 to test, my log4net version should be the latest one: log4net 1.2.10. Any help is appreciated. <?xml version="1.0" encoding="utf-8"?> <configuration> <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" /> </configSections> <log4net> <appender name="AdoNetAppender_SqlServer" type="log4net.Appender.AdoNetAppender"> <!--<threshold value="OFF" />--> <bufferSize value="1" /> <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <!--<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />--> <connectionString value="Data Source=.\MSSQLSERVER2008,2222;Initial Catalog=UnleashedSaaS;User ID=sa;Password=dogblack;" /> <commandType value="StoredProcedure" /> <commandText value="WriteLog" /> <parameter> <parameterName value="@log_date" /> <dbType value="DateTime" /> <layout type="log4net.Layout.PatternLayout" value="%date{yyyy'-'MM'-'dd HH':'mm':'ss'.'fff}" /> </parameter> <parameter> <parameterName value="@thread" /> <dbType value="String" /> <size value="255" /> <layout type="log4net.Layout.PatternLayout" value="%thread" /> </parameter> <parameter> <parameterName value="@log_level" /> <dbType value="String" /> <size value="50" /> <layout type="log4net.Layout.PatternLayout" value="%level" /> </parameter> <parameter> <parameterName value="@logger" /> <dbType value="String" /> <size value="255" /> <layout type="log4net.Layout.PatternLayout" value="%logger" /> </parameter> <parameter> <parameterName value="@message" /> <dbType value="String" /> <size value="4000" /> <layout type="log4net.Layout.PatternLayout" value="%message" /> </parameter> <parameter> <parameterName value="@exception" /> <dbType value="String" /> <size value="4000" /> <layout type="log4net.Layout.ExceptionLayout" /> </parameter> </appender> <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender" > <!--<threshold value="OFF" />--> <file value="LogData\\" /> <appendToFile value="true" /> <datePattern value="ul_yyyy-MM-dd.LOG" /> <maxSizeRollBackups value="10" /> <rollingStyle value="Date" /> <maximumFileSize value="2MB" /> <staticLogFileName value="false" /> <layout type="log4net.Layout.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %p %u %c %l %m %n%n%n" /> </layout> </appender> <root> <level value="ALL"/> <appender-ref ref="AdoNetAppender_SqlServer" /> <appender-ref ref="RollingLogFileAppender" /> </root> </log4net> </configuration>

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• I want to execute the commands in a loop at the same time, not one after another

  - by Felipe Alvarez

  I'd like to write a loop ('for') that will do some action 'X' number of times. But instead of performing the actions sequentially, one after another, I'd like them to execute simultaneously (in parellel at the same time). How can this be achieved? Script or a one liner are fine. example ONLY: for i in 1 2 3 4 5; do dd if=/dev/zero of=/tmp/disk$i bs=10M count=10; done

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• Making to the DNS on two different VPNs play nice.

  - by NitroxDM

  Setup: I have two separate networks I need to connect to at the same time. VPN 1 PPTP IP : 192.168.2.0/24 DNS : 192.168.2.32; 192.168.2.34 (Windows 2003) Domain : old.com Forwarder : 192.168.2.1 (Gateway running DNS) DD-WRT VPN 2 OpenVPN using Routing -- I'm going to switch to bridging IP : 192.168.10.0/24 DNS : 192.168.10.10 (Windows 2008) Domain : xyz.dc Forwarder : 192.168.10.1 (Gateway running DNS) ClearOS When I'm connected I would like to resolve host names on both networks without fully qualifying them.

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• Problem with bash scripting

  - by eple

  Hi. I terrible with bash scripting, and need some help with the following: #!/bin/bash if [ -e Pretty* ];then ncftpput -R -DD -v -u xbmc -p xbmc 192.168.1.100 /home/xbmc/TV/Pretty_Little_Liars/ Pretty* else echo "No new folders" fi find -depth -type d -empty -exec rmdir {} \; Problem here is the ncftpput line.. if I just do a simple [ echo "working" ] instead, everything is OK, but when I try the ncftpput-line it just gives me [ line 5: [: too many arguments ] the ncftpput command alone works fine.. Any ideas?

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• What are the most useful Vi/Vim Commands that you wish you'd discovered earlier?

  - by faceless1_14

  I personally learn by experimentation as opposed to reading documentation. A consequence of this is it takes me a long time to learn some of the useful features of a language like e going to the end of a word or 0 to go to the beginning of a line or $ for the end of a line as well as dd deleting a line What are some Vi/Vim commands that you find most useful but didn't know existed when you were first using Vi/Vim.

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• How to create a snapshot volume to a remote server?

  - by Purres

  I want to backup a few virtual machines to a backup server. Here're the backup steps. suspend a virtual machine create a snapshot of the virtual machine using lvcreate -s resume a virtual machine dd if=/virtual_machine_path | lzop > /temp/backup.lzo rsync /temp/backup.lzo -e "ssh " 1.2.3.4:/backup_path/ However, the hypervisor server doesn't have enough hard disk space to create a snapshot in step 2. Is there a way to create a logical volume snapshot to a remote server?

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• DCHP and Router load testing

  - by John H

  I manage a campground wifi network with an average of 10 - 60 active users. I have encountered issues where the router starts acting flaky (failing to assign DHCP or failing to pass traffic) without any clear warning (low cpu utilization, etc). I upgraded the router a couple times and ended up with a Netgear ProSafe VPN router that seems to be handling the traffic. The interesting thing is that the Netgear has lower specs than the Buffalo router it replaced, indicating the issue is with the DD-WRT firmware. While I'll be pursuing this issue on the dd-wrt forums, I need a way to test routers. My vision is having 1-2 computers connected on the LAN side and 1-2 computers connected on the WAN side. I want the LAN computers to be generating various type of traffic and connections, as well as requesting DCHP addresses. A few notes: The wireless aspect should be a non-issue. Most clients would connect to a wireless bridge and come into the router through a network cable. I had a monitoring server with Nagios running check_dhcp against the router. This server was connected directly by a network cable, eliminating wifi bridges and other devices from the equation. This question is somewhat related, but not exactly: Load testing wireless LANs I am going to look at IxChariot. While I'd ideally like to use a 1 computer on each side running Linux and preferably free software, I can entertain running Windows, multiple computers, or non-free software. Total bandwidth doesn't seem to be the issue. I can transfer large files all day. Even on the busiest days, the users seemed to only pull ~5Mbps. There is very little "LAN to LAN traffic" and most of it might never have reached the main router. The issue I need to test for seems to be tied to active users, or more appropriately, active sessions. I know active users or active clients is a meaningless term from a router standpoint and wouldn't mind having more appropriate terms to use. Summary: I need a way to test a routers ability in handling traffic from a large number of clients. My current strategy is to purchase a router, deploy it, and see how it fails in the live environment.

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• How do I fix a router which often reboots in high-load conditions?

  - by Ben Baril

  Hi all, I have a Linksys WRT54G v8 with DD-WRT micro installed. I find in high load situations (downloading a torrent for example) the router will simply restart several times. Any ideas what's wrong? Should I revert to the stock firmware?

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• How best to copy an SD card with corrupt filesystem to attempt recovery?

  - by pdbartlett

  I have an SD card with a corrupt filesystem, so wanted to clone it and attempt recovery on the copy (just in case of problems). I was thinking that dd-ing it Linux would be a sensible way to go, but don't really want to experiment in this situation. So if anyone has done this before then it would be good to know the exact approach that works. In case it helps, I have Ubuntu, OSX and Windows machines available. TIA, Paul.

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• How to create a Linux USB stick that boots on Mac?

  - by lhahne

  If I try to create a bootable USB stick by using dd to copy an ISO file to it, it usually works on PC but it won't appear in the boot menu of my Macbook. Is there an easy way to generate a bootable USB stick from an ISO file so that it would boot on a Mac?

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• Simple Duplication of several Machines (Imaging, with Linux)

  - by storrgie

  I have set up a single laptop (I have 10 of these exact models) for a demonstration next week. I want to copy the configuration (Fedora 13 with the software for demonstration) to the 9 other machines. Is this simply a dd operation? I may be thinking that I require more than what is really needed. Thanks for the assistance!

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• How safe it is to use Tomato web interface of Linksys WRT54GL to install OpenWRT on it?

  - by skfd

  I have Linksys WRT54GL with Tomato installed. Unfortently I can't use VLANs with this firmware, so I have to switch to OpenWRT (or DD-WRT). Is it safe to use web interface or I should use tftp way?

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• How to write image of a floppy disk to a flash drive?

  - by Usman Ajmal

  I have created an image of a floppy disk by executing: dd if=/dev/fd0 of=/home/myFloppy.img My floppy disk is no more working now. So I am thinking now if it's possible to write the image of that floppy to a flash drive and then i may boot my machine from the flash drive. My machine's BIOS has the option of 'Boot from USB'.

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• Read floppy from OpenVMS machine

  - by Goyuix

  I have a floppy I need to read the contents from - unfortunately it was formatted and the data written on an OpenVMS server. I believe the floppy is formatted "Files-11" and I can see parts of the MFT [equivalent] and file contents through a hex editor, however I would love to be able to mount this and actually read the files off. Is there a Files-11 FUSE module or other kernel module I can install to read this format? Any standalone utilities that can understand a floppy image taken with dd?

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