Grub Hard Disk Error Raid
HCL Search Reviews Search ISOs Go to Page... LinuxQuestions.org > Forums > Linux Forums > Linux - Software GRUB hard disk error on fresh ubuntu RAID install User Name Remember Me? Password Linux - Software This forum is for Software issues. Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum. Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today! Note that registered members see fewer ads, and ContentLink is completely disabled once you log in. Are you new to LinuxQuestions.org? Visit the following links: Site Howto | Site FAQ | Sitemap | Register Now If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here. Having a problem logging in? Please visit this page to clear all LQ-related cookies. Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own. Click Here to rece
the mirroring between two drives. Then one of the drives fail (which they eventually will), here is how you fix it: I have taken info from these pages for this blog post: http://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array http://blog.mydream.com.hk/howto/linux/howto-reinstall-grub-in-rescue-mode-wh… In this example I have two hard drives, /dev/sda and /dev/sdb, with the partitions /dev/sda1 and /dev/sda2 as well as /dev/sdb1 and /dev/sdb2. /dev/sda1 and /dev/sdb1 make up the RAID1 array /dev/md0. /dev/sda2 and /dev/sdb2 make up the RAID1 array /dev/md1. /dev/sda1 + /dev/sdb1 = /dev/md0 /dev/sda2 + /dev/sdb2 = /dev/md1 /dev/sdb has failed, and we want to replace it. First of all: ‘cat /proc/mdstat' http://www.linuxquestions.org/questions/linux-software-2/grub-hard-disk-error-on-fresh-ubuntu-raid-install-616960/ is your friend - it will show you the status of your raid during the whole process. In the output from ‘cat /proc/mdstat' you will see an (F) behind a failed device, or it will be missing alltogether. First, fail and remove the failed device(s): mdadm -manage /dev/md0 -fail /dev/sdb1 mdadm -manage /dev/md0 -remove /dev/sdb1 Repeat for other MD-devices containing sdb-parts. Now the output from ‘cat /proc/mdstat' should only https://mortencb.wordpress.com/2012/10/04/fixing-drive-failure-when-using-mdadmraid1-on/ contain parts from sda. Power down, change the drive, and turn it back on. To make the same partitions on sdb as you have on sda, do this: sfdisk -d /dev/sda | sfdisk /dev/sdb ‘fdisk -l' should now show the same partitions on sda and sdb. Next, add the proper parts from sdb to the relevant md-device. So if md0 contains sda1, do this: mdadm -manage /dev/md0 -add /dev/sdb1 Repeat for all md-devices so you have the same parts from sda and sdb in all of them. Check with ‘cat /proc/mdstat'. Let is sync back up (check with ‘watch -n 10 cat /proc/mdstat' until it finishes). Now, fix grub: grub grub>root (hd0,0) grub>setup (hd0) If you're unlucky and can't' boot because the wrong device is first (trying to boot from the clean/new hard drive), follow these steps: First boot into a live cd with your os. Then activate the RAID: 1) mkdir /etc/mdadm 2) mdadm -examine -scan > /etc/mdadm/mdadm.conf 3) mdadm -A -scan Then reinstall grub. In this example, you have /boot on md0 and / on md1: 1) mkdir /mnt/sysimage 2) mount /dev/md1 /mnt/sysimage 3) mount -o bind /dev /mnt/sysimage/dev 4) mount -o bind /proc /mnt/sysimage/proc 5) chroot /mnt/sysimage /bin/bash 6) mount /dev/md
installed it in RAID1, it works perfectly, ok! :)When I pull out one of the pendrive [good pendrive], it still boots up,hurrah :)But: ...When I pull out http://grokbase.com/t/centos/centos/105nrdc951/grub-hard-disk-error the other pendrive [i plug in the first one i tried] itsay's:GRUB hard disk errorWhat can I do?I already tried:grub-install /dev/sdc <-that's the pendrive name [bios -> hard driveemulation=hard drive, not auto]or:# http://serverfault.com/questions/612529/linux-raid-1-how-to-make-a-secondary-hd-boot grubfind /boot/grub/stage1hd0,0hd1,0root (hd0,0)setup (hd0,0)etc.What's the solution? Please help me:\I can't just dd the first 512 Byte of the "good pendrive", because theuuid is stored there. [needed for the sraid..]It gets to the grub hard grub, so it's not a ""boot-order problem""How can I install grub to these two pendrives, so that if one of thependrives die, it would still be a bootable system? reply Tweet Search Discussions Search All Groups centos 4 responses Oldest Nested Phil Schaffner This is the CentOS list. ... Does "etc." mean you installed GRUB on (hd1) as well? Did you do that before you grub hard disk started yanking devices? Phil Schaffner at May 21, 2010 at 4:43 pm ⇧ Jozsi Vadkan wrote on 05/21/2010 12:29 PM:I've got two pendrives.I want to install a Debian on them. RAID1.This is the CentOS list....I already tried:grub-install /dev/sdc <-that's the pendrive name [bios -> hard driveemulation=hard drive, not auto]or:# grubfind /boot/grub/stage1hd0,0hd1,0root (hd0,0)setup (hd0,0)etc.Does "etc." mean you installed GRUB on (hd1) as well? Did you do thatbefore you started yanking devices? reply | permalink Jozsi Vadkan yes, i tried to install it to hd1,0 too. 2010. 05. 21, p?ntek keltez?ssel 12.43-kor Phil Schaffner ezt ?rta: Jozsi Vadkan at May 22, 2010 at 3:41 pm ⇧ yes, i tried to install it to hd1,0 too.2010. 05. 21, p?ntek keltez?ssel 12.43-kor Phil Schaffner ezt ?rta:Jozsi Vadkan wrote on 05/21/2010 12:29 PM:I've got two pendrives.I want to install a Debian on them. RAID1.This is the CentOS list....I already tried:grub-install /dev/sdc <-that's the pendrive name [bios -> hard driveemulation=hard drive, not auto]or:# grubfind /boot/grub/stage1hd0,0hd1,0root (hd0,0)setup (hd0,0)etc.Does "etc." mean you installed GRUB on (hd1) as well? Did you do thatbefore you started yanking devices?_______________________________________________CentOS mailing listCentOS at centos.orghttp://lists.centos.org/mailman/listinfo/centos reply | permalink Cornel panceac 2010/5/22 Jozsi Vadkan do you have
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Linux RAID 1: How to make a secondary HD boot? up vote 3 down vote favorite 2 I have the following RAID 1 on a Centos 6.5 server: # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sdb1[3] 974713720 blocks super 1.0 [2/1] [_U] bitmap: 7/8 pages [28KB], 65536KB chunk md1 : active raid1 sdb2[3] sda2[2] 2045944 blocks super 1.1 [2/2] [UU] unused devices: