Raid 5 Replace failed drive

Raid 5 Replace failed drive – Create partitions, add the new drive, check if the raid is syncing and have a look at the mdstat file.

Create the partitions like on the other drives

parted /dev/sdb mklabel gpt
parted -a optimal — /dev/sdb mkpart primary 2048s -8192s
parted /dev/sdb set 1 raid on

Add the new drive to the raid

root@homeserver:~# mdadm –manage /dev/md0 –add /dev/sdb1
mdadm: added /dev/sdb1

Check if the raid is syncing

root@homeserver:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : active raid5 sdb1[4] sdd1[1] sdc1[3]
5860259840 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [_UU]
[>....................] recovery = 0.0% (544996/2930129920) finish=985.4min speed=49545K/sec
bitmap: 16/22 pages [64KB], 65536KB chunk

unused devices:

After a night the raid is synced (depending on the size of the raid)

root@homeserver:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : active raid5 sdb1[4] sdd1[1] sdc1[3]
5860259840 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
bitmap: 3/22 pages [12KB], 65536KB chunk

unused devices: <none>

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