Linux software RAID

Replace failing drive in software raid 1

Check which drive is failing

# cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sda4[0]
      1822442815 blocks super 1.2 [2/1] [U_]

md2 : active raid1 sda3[0]
      1073740664 blocks super 1.2 [2/1] [U_]

md1 : active raid1 sda2[0]
      524276 blocks super 1.2 [2/1] [U_]

md0 : active raid1 sda1[0]
      33553336 blocks super 1.2 [2/1] [U_]

unused devices: <none>

Remove drive:

# mdadm /dev/md0 -r /dev/sdb1
# mdadm /dev/md1 -r /dev/sdb2
# mdadm /dev/md2 -r /dev/sdb3
# mdadm /dev/md3 -r /dev/sdb4

Backup mbr/gpt table MBR:

# sfdisk --dump /dev/sda > sda_parttable_mbr.bak

GPT:

# sgdisk --backup=sda_parttable_gpt.bak /dev/sda

Restore mbr/gpt table MBR:

# sfdisk /dev/sdb < sda_parttable_mbr.bak

GPT:

# sgdisk --load-backup=sda_parttable_gpt.bak /dev/sdb

Add new partitions to raid

# mdadm /dev/md0 -a /dev/sdb1
# mdadm /dev/md1 -a /dev/sdb2
# mdadm /dev/md2 -a /dev/sdb3
# mdadm /dev/md3 -a /dev/sdb4

Check if its rebuilding

# cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sdb4[1] sda4[0]
      1028096 blocks [2/2] [UU]
      [==========>..........]  resync =  50.0% (514048/1028096) finish=97.3min speed=65787K/sec

md2 : active raid1 sdb3[1] sda3[0]
      208768 blocks [2/2] [UU]

md1 : active raid1 sdb2[1] sda2[0]
      2104448 blocks [2/2] [UU]

md0 : active raid1 sdb1[1] sda1[0]
      208768 blocks [2/2] [UU]

unused devices: <none>

Install bootloader on new drive

# grub-mkdevicemap -n
# grub-install /dev/sdb