Hello,
I have two disks sda and sdb. One of the was broken so I have changed the broken disk with a working one. I started the server in rescue mode, and created the partional table, and added all the partitions to the software raid.
*I have added the partitions to the RAID, and reboot.*
# mdadm /dev/md0 --add /dev/sdb1 # mdadm /dev/md1 --add /dev/sdb2 # mdadm /dev/md2 --add /dev/sdb3 # mdadm /dev/md3 --add /dev/sdb4
*After reboot, server did not boot. So I do the followings:*
# mount /dev/md1 /mnt/rescue # mount /dev/md0 /mnt/rescue/boot # mount -o bind /dev /mnt/rescue/dev # mount -o bind /proc /mnt/rescue/proc # mount -o bind /dev/shm /mnt/rescue/dev/shm # mount -o bind /sys /mnt/rescue/sys # chroot /mnt/rescue
*I checked the device.map* # cat /boot/grub/device.map (hd0) /dev/sda (hd1) /dev/sdb
*And, install the grub.* # grub Probing devices to guess BIOS drives. This may take a long time.
GNU GRUB version 0.97 (640K lower / 3072K upper memory)
[ Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename.] grub> root (hd0,0) root (hd0,0) Filesystem type is ext2fs, partition type 0xfd grub> setup (hd0) setup (hd0) Checking if "/boot/grub/stage1" exists... yes Checking if "/boot/grub/stage2" exists... yes Checking if "/boot/grub/e2fs_stage1_5" exists... yes Running "embed /boot/grub/e2fs_stage1_5 (hd0)"... 15 sectors are embedded. succeeded Running "install /boot/grub/stage1 (hd0) (hd0)1+15 p (hd0,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded Done. grub> root (hd1,0) root (hd1,0) Filesystem type is ext2fs, partition type 0xfd grub> setup (hd1) setup (hd1) Checking if "/boot/grub/stage1" exists... yes Checking if "/boot/grub/stage2" exists... yes Checking if "/boot/grub/e2fs_stage1_5" exists... yes Running "embed /boot/grub/e2fs_stage1_5 (hd1)"... 15 sectors are embedded. succeeded Running "install /boot/grub/stage1 (hd1) (hd1)1+15 p (hd1,0)/boot/grub/stage2 /boot/grub/grub.conf"... succeeded Done. grub> quit quit
*But it still does not boot. What should I do at this point? What do you suggest?*
*Disk informations*
# fdisk -l /dev/sd[ab]
Disk /dev/sda: 1500.3 GB, 1500301910016 bytes 255 heads, 63 sectors/track, 182401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00090dd1
Device Boot Start End Blocks Id System /dev/sda1 * 1 131 1052226 fd Linux raid autodetect /dev/sda2 132 5353 41945715 fd Linux raid autodetect /dev/sda3 5354 96733 734009850 fd Linux raid autodetect /dev/sda4 96734 182401 688128210 fd Linux raid autodetect
Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes 255 heads, 63 sectors/track, 182401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xf5c3aa6a
Device Boot Start End Blocks Id System /dev/sdb1 * 1 131 1052226 fd Linux raid autodetect /dev/sdb2 132 5353 41945715 fd Linux raid autodetect /dev/sdb3 5354 96733 734009850 fd Linux raid autodetect /dev/sdb4 96734 182401 688128210 fd Linux raid autodetect
*Raid info*
# cat /proc/mdstat Personalities : [raid1] md3 : active raid1 sda4[0] sdb4[2] 688128128 blocks [2/1] [U_] resync=DELAYED
md2 : active raid1 sda3[0] sdb3[2] 734009728 blocks [2/1] [U_] [>....................] recovery = 1.8% (13651648/734009728) finish=133.5min speed=89915K/sec
md1 : active raid1 sdb2[2] sda2[0] 41945600 blocks [2/1] [U_] resync=DELAYED
md0 : active raid1 sda1[0] sdb1[1] 1052160 blocks [2/2] [UU]
unused devices: <none>
*Mount informations*
*/dev/md0 is mounted /boot /dev/md1 is mounted / **/dev/md2 and /dev/md3 is for backup and some personal data*
*Here is the grub.conf*
# cat /mnt/rescue/boot/grub/grub.conf
timeout 5 default 0
fallback 1
title CentOS (2.6.18-238.19.1.el5) root (hd1,0) kernel /vmlinuz-2.6.18-238.19.1.el5 ro root=/dev/md1 vga=0x317 initrd /initrd-2.6.18-238.19.1.el5.img
title CentOS (2.6.18-238.9.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-238.9.1.el5 ro root=/dev/md1 vga=0x317 initrd /initrd-2.6.18-238.9.1.el5.img
title CentOS (2.6.18-194.26.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-194.26.1.el5 ro root=/dev/md1 vga=0x317 initrd /initrd-2.6.18-194.26.1.el5.img
title CentOS (2.6.18-194.3.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-194.3.1.el5 ro root=/dev/md1 vga=0x317 initrd /initrd-2.6.18-194.3.1.el5.img
title CentOS (2.6.18-164.15.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-164.15.1.el5 ro root=/dev/md1 vga=0x317 initrd /initrd-2.6.18-164.15.1.el5.img
title CentOS Linux (2.6.18-164.11.1.el5) root (hd0,0) kernel /boot/vmlinuz-2.6.18-164.11.1.el5 ro root=/dev/md1 vga=0x317 initrd /boot/initrd-2.6.18-164.11.1.el5.img