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• Improving mdadm RAID-6 write speed

  - by BarsMonster

  Hi! I have a mdadm RAID-6 in my home server of 5x1Tb WD Green HDDs. Read speed is more than enough - 268 Mb/s in dd. But write speed is just 37.1 Mb/s. (Both tested via dd on 48Gb file, RAM size is 1Gb, block size used in testing is 8kb) Could you please suggest why write speed is so low and is there any ways to improve it? CPU usage during writing is just 25% (i.e. half of 1 core of Opteron 165) No business critical data there & server is UPS-backed. mdstat is: Personalities : [raid6] [raid5] [raid4] md0 : active raid6 sda1[0] sdd1[4] sde1[3] sdf1[2] sdb1[1] 2929683456 blocks super 1.2 level 6, 1024k chunk, algorithm 2 [5/5] [UUUUU] bitmap: 0/8 pages [0KB], 65536KB chunk unused devices: <none> Any suggestions?

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• install xp from a pen drive containing .iso file?

  - by bobby

  i want to install xp using my pen drive which has a .iso of win xp...!! i have tried googling but the results wer confusing some them wer how to install xp in a pen drive and all ...if anyone could give me a link that i could refer...!!

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• My Portable Hard Drive with USB3 didn't work when connected to My Laptop, but it working with USB2 properly

  - by Mohammad Hasan Esfahanian

  I have Western Digital My Passport Essential Portable Hard Drive with USB3 and Model:WDBACY5000ABK-EESN. Until about two or three months ago when I connected that to My Laptop USB3 port, that worked very well. But now when I'm connecting that to My device, The system does not detect any Hard Drives. When plug in the USB2 port is working properly. I connected that to another Laptop whit USB3 port but I had the same problem. I tested My Laptop port with a Flash Memory by USB3 and ports were healthy and I'm sure they are working. For this issue, I changed the windows, but it still did not work. What can I do? Thanks in advance.

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• All items in my pen drive had been renamed automatically and cannot open it

  - by pabz

  All the items (both files and folders) inside my pen drive had been renamed to some characters like :]h.¡?.A++ and when I try to open any folder Windows gives this message. The filename,directory name, or volume label syntax is incorrect I was told that it is a problem of the pen drive, not a virus. They say if I format the pendrive then I will be able to use it again normally. But I'm not sure. And I need those files. Does anybody knows a solution?

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• Virus that makes all files and folders read-only filesystem on a usb drive

  - by ren florento

  Is there any way on how to remove a virus from Windows that makes the files and folders and the usb drive itself a read-only filesystem as this is an annoying one because the virus keeps copying itself as long as it sees a folder and keeps running which prevents you from creating and deleting files and folders from the usb drive and makes " mount -o remount,rw '/path' " ineffective ? btw i'm not really sure if it is a virus but what makes me think that it is a virus is for the reason the it creates a .exe file within every folder which was named after folder and it also immediately reverts to read-only filesystem which locks the files and folders even after executing the command " mount -o remount,rw '/path' ". i also think the virus is just running only within the usb drive as it is not affecting the folders on ubuntu. I could choose to reformat the usb drive as it only contains few important files but what concerns me is if such virus or whatever you may call it gets into my backup drives that contains many important files.Thanks for any help and advice you could give.

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• can't install with usb pen drive, SYSLINUX problem

  - by nkint

  i'm on ubuntustudio and i want to format my hd and try kubuntu (install in my acer notebook, no partion, no double operating system problem, only istall it) i've downloaded iso file ( kubuntu-10.10-desktop-i386.iso ), insert usb pen drive, then: system administration startup disk creator erased usb pen content, and "make startup disk" finally, reboot computer with pen inside usb port normal boot didn't start (as expected) but only black screen with this signal: SYSLINUX 4.03 2010-10-22 EDD Copyright (c) 1994-2010, H. Peter Anvin et al unknown keyword in configuration file boot: i've tried different usb pen stick and different iso files (ubuntu, kubuntu, netbook edition).. always same problem (sometimes only the first line without "unknow keyword in conf file" error) some advice?? sorry for my bad english

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• How to boot Ubuntu 12.04-64bit from a USB from Compaq CQ58

  - by user208092

  I try to boot Ubuntu 12.04, 64-bit on my Compaq CQ58 laptop from a USB but it is not working. I've correctly installed the Ubuntu on my pen drive following the instructions on Ubuntu website. (http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-windows) These are my BIOS settings: Post Hotkey Delay (sec) <0 CD-ROM Boot Internal Network Adapter Boot Network Boot Protocol Legacy Support Secure Boot Platform Key Enrolled Pending Action None Clear All Secure Boot UEFI Boot Order: USB Diskette on Key/USB Hard Disk OS Boot Manager Internal CD/DVD ROM Drive ! Network Adapter With these settings when i restart my computer what shows up is: Boot Device Not Found. This is what I get on the Boot Manager: Boot Option Menu OS boot Manager Boot From EFI File (Arrow Up) and (Arrow Down) to change option, ENTER to select an option. Press F10 to BIOS Setup Options, ESC to exit. PLEASE HELP... P.S. My laptop has windows 8

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• Persistence problem when installing USB Ubuntu variant using Windows

  - by Derek Redfern

  I'm part of a project called One2One2Go - we're developing a Live USB Ubuntu variant for use in schools in Somerville, MA. We have the project files compiled into an iso, and when installed using the native Ubuntu Startup Disk Creator, the USB works fine. When installed using a tool on a Windows machine (LiLi at linuxliveusb.com or liveusb-creator at fedorahosted.org/liveusb-creator), the USB works, but does not have persistence. This happens even if the creator is specifically set to allocate an area for persistent files. When comparing files on sticks created in Windows or Ubuntu, the one file that is different is syslinux/syslinux.cfg. I have printed the contents of the file below: Installed on Windows: DEFAULT nomodset LABEL debug menu label ^debug kernel /casper/vmlinuz append boot=casper xforcevesa initrd=/casper/initrd.gz -- LABEL nomodset menu label ^nomodset kernel /casper/vmlinuz append boot=casper quiet splash nomodset initrd=/casper/initrd.gz -- LABEL memtest menu label ^Memory test kernel /install/memtest append - LABEL hd menu label ^Boot from first hard disk localboot 0x80 append - PROMPT 0 TIMEOUT 1 Installed on Ubuntu: DEFAULT nomodset LABEL debug menu label ^debug kernel /casper/vmlinuz append noprompt cdrom-detect/try-usb=true persistent boot=casper xforcevesa initrd=/casper/initrd.gz -- LABEL nomodset menu label ^nomodset kernel /casper/vmlinuz append noprompt cdrom-detect/try-usb=true persistent boot=casper quiet splash nomodset initrd=/casper/initrd.gz -- LABEL memtest menu label ^Memory test kernel /install/memtest append - LABEL hd menu label ^Boot from first hard disk localboot 0x80 append - PROMPT 0 TIMEOUT 1 For troubleshooting reasons, I changed the Windows-created syslinux.cfg to match the one created by Ubuntu and persistence worked on it. I think the problem is that on the stick created by Windows, there is no "persistent" flag, but I don't know why. Is this a problem with our disk image or with the creator? How would I go about fixing this problem? Thanks in advance for your help. Derek Redfern

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• Ubuntu USB boot failure

  - by Steve

  When trying to boot from a boot USB drive I got the message, "Vesamenu.c32:Not a com32r image." I was trying to boot a fairly new Toshiba laptop with a Ubuntu 10.04.2 LTS created USB boot. I re-created the USB drive with 11.04 and it booted fine. These were both 32 bit versions even though the laptop is a 64 bit. I was trying to create a generic boot USB that would work on everything I might try it on. What is the consensus on this idea? Any solution to the above error? Thanks from a noobe.

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• How to Create a bootable Ubuntu USB flash drive from terminal

  - by Avinash Raj

  Is there any possibility to create a Ubuntu USB flash drive from terminal without using any third-party applications like YUMI,Unetbootin,etc. I tried to create a bootable ubuntu flash drive with dd method, sudo umount /dev/sdb sudo dd if=/path/to/ubuntu.iso of=/dev/sdb bs=1M It create files on the USB disk,but when i try to boot the usb disk it says Operating System Not Found error. Any help will be appreciated!

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• Cisco PrecisionHD USB Camera (Detected but no video)

  - by Marcel Bissonnette

  I'm having an issue with my Cisco PrecisionHD USB Camera. It is detected but does not show video (using "Cheese Webcam Booth"). Any ideas? (I'm a newbie with ubuntu) Specs: Ubuntu 12.10 32bit Dell Latitude E6400 Cisco PrecisionHD USB Camera (USB 2.0) connected directly into laptop (no docking station) Troubleshooting: Using the command lsusb, I find the following device: Bus 002 Device 003: ID 1f82:0001 TANDBERG PrecisionHD Camera '+ more devices like audio, finger swipe, Linux foundation 2.0, 1.1 So what now? Thanks. MB

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• Download Speed is 0.12 Mbps when tested with servers in U.S, but it is 0.76 Mbps when tested with local servers, normal? [closed]

  - by Graviton

  Feeling that my ISP is cheating my money ( My subscription package is 1 Mbps), I did a speed test on my internet connection using www.speedtest.net. I tried to test the connection speed on two servers, one local ( Malaysia), another in U.S. I found that while the upload speed remain constant, but the download speed is different; 0.76 Mbps for servers in Malaysia, and 0.12 Mbps for servers in U.S. I called the ISP, and they blamed it on the intercontinental signal lost. But how can it be that the speed differs by that much? If it really differs by that much than we should always take a grain of salt of what is advertised as the broadband speed because the advertised speed is not the speed we are getting. No?

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• Wont boot from USB, stops at SYSLINUX copyright

  - by Steve

  Created bootable 11.10 in Windows from Universal USB Installer 1.8.6.8, upon boot in my HP Mini Netbook it displays only this: SYSLINUX 4.04 EDD 2011-04-18 Copyright (C) 1994-2011 H. Peter Anvin et al _(Blinky Cursor) I tried removing "ui" from syslinux.cfg, no change... (Re: can't install with usb pen drive, SYSLINUX problem) I also tried creating a bootable USB using unetbootin-windows-563, no change. Does anybody have any other ideas?

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• Having issues using fdisk and GParted with Lexar 64GB USB, but reading and writing is fine

  - by MetaDark

  I have recently bought a new 64GB Lexar USB with the long model name of LJDV10-64G-000-106, and I am having issues partitioning it. I am able to mount, read and write to the USB without any issues but whenever I try to partition it with GParted it doesn't show up in the dropdown. Also while using the command sudo fdisk -l I receive the error fdisk: unable to seek on /dev/sdc: Invalid argument. This is a brand new USB so I am not sure why I am having these issues, especially since the device is functioning perfectly with read/write. I have tried reformatting it on a windows machine but that does not seem to do anything. For those who want a visual my USB looks almost exactly like But 64GB rather than 8GB Edit: I have just ran GParted from the terminal and I am getting a similar error, but it may give more information on the issue. Could not determine physical sector size for /dev/sdc. Using the logical sector size (512). Invalid argument during seek for read on /dev/sdc Also clearing my USB with /dev/zero fails with the the message $ sudo dd if=/dev/zero of=/dev/sdc bs=1M dd: writing `/dev/sdc': No space left on device 1+0 records in 0+0 records out 0 bytes (0 B) copied, 0.00167254 s, 0.0 kB/s

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• Ubuntu on a USB

  - by Sander de Lange

  I was just wondering if anyone had a good experience with Ubuntu on a flash drive... I'm installing it right now. I formatted my 16GB flash drive to Ext2 because the default file system is ext4 but that one is journaled and USB flash drives do not like journaling. I want to use this to learn Java and Ubuntu seems to be a great OS for this. I (obviously) have USB 2.0 ports where I will put the USB in. How is the boot time of Ubuntu on a USB?

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• No boot record when installing 13.04 from USB on WinXP

  - by Phil Leslie

  I'm replacing WinXP with 13.04 on an older PC using wubi.exe on a USB stick. I had no problem changing the BIOS on another system that was a bit newer but when I change the settings on the older PC to boot from USB, I get a DOS message saying "Searching for boot record...Not found" & asked to try again. I don't have the ability to boot from a live CD so is there a reason why I can boot from a USB on a newer computer but can't from an older one? Both have options to choose to boot from USB, but the older one can find no boot record. The system was built on 12/13/01 by American Megatrends. Since I don't have enough "reputation points" to post the screen shot image, you can see it at http://img.photobucket.com/albums/v633/boonevillephil/1029131748-00.jpg.

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• Does Ubuntu run well on an USB HDD?

  - by Klaus

  I have here a company notebook, and because the HDD is full encrypted, I cannot install an extra partition for another system that I would like to use in my free time. And I really need another system, because this crap Windows here with that much of anti-virus, anti-spyware, anti-whatever on it is so slow and annoying. What can I do? I could use an external USB HDD with another system. Because I would like to handle big files and so on, I don't want to use a USB stick. A USB 2.5 HDD + Ubuntu is what I think the best option. Here are my questions: Do I have to note something? Does Ubuntu run well on an external HDD? Do I have big performance problems (because of the USB HDD)? Should I buy a very fast HDD for much money or it is not that important? Any suggestions?

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• How USB drives goes after system hard drives

  - by raihanchy

  I am using Ubuntu 12.04 LTS. My hard drives usually comes as: sda, with 'sudo blkid' and if I plug-in any USB drive, they comes as: sdb, sdc etc; after sda. That's fine!!! But problem arises after I restart my laptop with connecting those USB drives. They alter and comes first and hard drive goes to the end, like: 'sudo blkid' shows, sda, sdb for USB drives and sdc for hard drives. It's making problem to mount with /etc/fstab. I couldn't find any solutions for this. I would like to have any USB drives after my system hard drives, as in Windows. Please, help me at this point. Thanking you. Raihan

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• Update usb Driver

  - by Enrico Caponi

  i just now start to use Xubuntu, and i install Xubuntu on my second laptop i had in my garage, just for put back in use. On the ASUS xubuntu work really perfect but now after i put on my old laptop i have some little proble. My Laptop old is a Fujitsu Siemens AMILO L7310GW, i explain my problem: The installation works fine, everything is quite good but there are few little problem i have a know idea, how I can fix them... so USB: i have a optical mouse usb and works quite strage, when i tip on terminal "lsusb" the system recognized fine my mouse but the strange thing is the mouse it move like jump around the desktop. what i had done: - update the usbdrive - change mouse - tried mouse on different pc and on both they work fine another problem i don't know where came from: when i take off my mouse, and try to put back doesn't work at all, if i want back i have to restart the OS. and no usb pen or other ar working so for that i think is usb problem. i can tell before Xubuntu whit winXP the usb work fine, but i don't want windows anymore... So i tried almost everything you can find on the net, maybe i have done something wrong so please help me. I tried also to install the new version 12.04, but i came back for the 11.10.

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• Ubuntu not booting from USB on laptop (no optical drive)

  - by Jamie

  I'm using a Kingston 16GB USB, with the Unetbootin program. (I've tried both downloading the installation iso manually and adding it, or using the program to download.) I've tried creating the bootable USB on an iMac, the laptop and also a desktop. I've booted into the setup of the laptop and changed the boot order to make sure it boots from that drive first. (There is no optical drive so that isn't a problem.) It's an Acer Aspire AS3810TZ. Upon booting it gives this message: SYSLINUX 4.03 2010-10-22 EDD Copyright (C) 1994-2010 H. Peter Anvin et al I get this no matter how I create the USB, it just sits there. I left the laptop for an hour and it hadn't moved. I've also tried on a different 4GB USB (Generic) and that did the same.

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• install to USB without touching windows MBR

  - by Robert

  I would like as full of an install as possible (most notably no casper, just straight on the drive) on a USB stick, but I'm not allowed to touch the current configuration of the computer I'll be running it on at all (except of course changing the boot options to boot from usb). Most guides I read are about getting a live install with persistence on USB, or (I think) still replace the MBR with GRUB. Is there any way to combine the two, and not touch the underlying system?

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• Booting from Live USB leads to command line instead of menu

  - by Alek

  I'm trying to install 12.04 x64 from a USB stick. I created the Live USB as per instructions from ubuntu.com, however, after choosing to boot from USB I get stuck with a command line, titled GRUB. When I type "install", it replies that "no kernel is loaded". On my other PC everything is fine, the Live USB boots just fine. The one I'm trying to install to has UEFI mobo - maybe that's the problem? However, fiddling with UEFI settings in mobo setup (UEFI/Legacy) has no visible effect.

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• Update live USB distro?

  - by qubex

  I have Lubuntu 14.04 (and Ubuntu 14.04) on a pair of USB disks created by writing the img files to USB using dd on Mac OS X. Unfortunately these systems both have some known bugs (that have since been corrected) and lack certain important drivers for my system (which I have located online). How can I make the USB disks writable and how do I update the distribution upon them as one may do for a locally-installed system? And if I later proceed to install from these USB sticks onto a hard-drive, will they ‘carry’ the package and driver updates with them or will I have to start from scratch again? (I seem to remember from my ancient Windows XP days that such procedures were referred to as ’slipstreaming’ or somesuch on that side of the fence.) (No, I did not create a persistence partition when I created the sticks, because from Mac clearly that isn’t an option. And anyway, as I imperfectly understand it, the persistence partition is for user files and not for the modification of the system.)

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• USB 3.0 controller is not recognized by Ubuntu 12.04

  - by BlueWanderer

  I have a Thinkpad E430 notebook, and the intel's USB 3.0 controller can not be recognized by Ubuntu 12.04. The LED on my USB-HDD is white instead of blue (And in Windows 7, it is blue when connected to USB 3.0 port, and is white when connected to 2.0). And the transfer speed is around 25MB/s instead of 65MB/s in Windows 7. I'm not familiar with Linux systems, so I've no clue about what's going wrong. I've searched the web, but got no solution.

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• DVC101 Video Capture Device on USB hub - Ubuntu Server 12.04

  - by John

  I have a Dell Inspiron 8600 laptop I use as a media server/video capture system. It only has 2 USB ports and I have a total of 3 devices I need to connect. The DVC101 works perfectly while plugged directly into the USB port in back of the laptop. Unfortunately it does not get recognized when plugged into a passive or powered USB hub. Questions: Is there something I am missing on the Ubuntu side? Something I need to do that will allow the device to be recognized through the hub? If not, will the extra USB ports on a dell laptop dock (port replicator) act the same as the aftermarket hubs? I know this one is off topic of Ubuntu but any input appreciated.

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