Rebuilding RAID 1 Array in Linux with a new hard disk after a disk fault - Howto with screen shots
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From: Siju George on 16 Jun 2010 07:20 Hope some one finds this helpful :-) --Siju Rebuilding RAID 1 Array in Linux with a new hard disk after a disk fault. ========================================================================= ** Actual screen shot from terminal of steps taken during rebuild on 10-June-2010 on Debian Lenny ( Linux )** 1) Check the partitions layout on the current hard disk srv1:~# fdisk /dev/sda The number of cylinders for this disk is set to 60801. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): p Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x0000dd6e Device Boot Start End Blocks Id System /dev/sda1 1 122 979933+ fd Linux raid autodetect /dev/sda2 123 1338 9767520 fd Linux raid autodetect /dev/sda3 1339 2554 9767520 fd Linux raid autodetect /dev/sda4 2555 60801 467869027+ fd Linux raid autodetect Command (m for help): quit srv1:~# 2) Create identical partitions on the new disk using 'fdisk'. Partition Id should be 'fd' for all RAID partitions. The resulting layout should look like. srv1:~# fdisk /dev/sdb The number of cylinders for this disk is set to 60801. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): p Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xe3a3a447 Device Boot Start End Blocks Id System /dev/sdb1 1 122 979933+ fd Linux raid autodetect /dev/sdb2 123 1338 9767520 fd Linux raid autodetect /dev/sdb3 1339 2554 9767520 fd Linux raid autodetect /dev/sdb4 2555 60801 467869027+ fd Linux raid autodetect Command (m for help): q srv1:~# 3) Check the current RAID status srv1:~# cat /proc/mdstat Personalities : [raid1] md3 : active raid1 sda4[1] 467868928 blocks [2/1] [_U] md2 : active raid1 sda3[1] 9767424 blocks [2/1] [_U] md1 : active raid1 sda2[1] 9767424 blocks [2/1] [_U] md0 : active raid1 sda1[1] 979840 blocks [2/1] [_U] unused devices: srv1:~# 4) Rebuild the arrays and check thr status srv1:~# mdadm -a /dev/md0 /dev/sdb1 mdadm: added /dev/sdb1 srv1:~# mdadm -a /dev/md1 /dev/sdb2 mdadm: added /dev/sdb2 srv1:~# mdadm -a /dev/md2 /dev/sdb3 mdadm: added /dev/sdb3 srv1:~# mdadm -a /dev/md3 /dev/sdb4 mdadm: added /dev/sdb4 srv1:~# cat /proc/mdstat Personalities : [raid1] md3 : active raid1 sdb4[2] sda4[1] 467868928 blocks [2/1] [_U] [>....................] recovery = 0.0% (285440/467868928) finish=54.5min speed=142720K/sec md2 : active raid1 sdb3[0] sda3[1] 9767424 blocks [2/2] [UU] md1 : active raid1 sdb2[0] sda2[1] 9767424 blocks [2/2] [UU] md0 : active raid1 sdb1[0] sda1[1] 979840 blocks [2/2] [UU] unused devices: srv1:~# 5) Install grub on the MBR of new hard disk srv1:~# grub-install /dev/sdb Searching for GRUB installation directory ... found: /boot/grub Installation finished. No error reported. This is the contents of the device map /boot/grub/device.map. Check if this is correct or not. If any of the lines is incorrect, fix it and re-run the script `grub-install'. (hd0) /dev/sda (hd1) /dev/sdb srv1:~# -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/AANLkTinFEzNI1ezQ0VkDo4rYhH7UOlrugaAJe9_L11fc(a)mail.gmail.com |