raid 5 – remove disk/drive

Initial situation: Raid 5 is intact

root@homeserver:~# cat /proc/mdstat
 Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
 md0 : active raid5 sdb1[0] sdd1[3] sdc1[1]
 5860259840 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]
 bitmap: 5/22 pages [20KB], 65536KB chunk

unused devices: <none>

Mark the drive as failed:

mdadm --manage /dev/md0 --fail /dev/sdb1

Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
 md0 : active raid5 sdb1[0](F) sdd1[3] sdc1[1]
 5860259840 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [_UU]
 bitmap: 6/22 pages [24KB], 65536KB chunk

unused devices: <none>

Remove the drive from the raid:

mdadm --manage /dev/md0 --remove /dev/sdb1

root@homeserver:~# cat /proc/mdstat
 Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
 md0 : active raid5 sdd1[3] sdc1[1]
 5860259840 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [_UU]
 bitmap: 6/22 pages [24KB], 65536KB chunk

unused devices: <none>
root@homeserver:~# mdadm --detail /dev/md0
 /dev/md0:
 Version : 1.2
 Creation Time : Thu Sep 10 20:49:23 2015
 Raid Level : raid5
 Array Size : 5860259840 (5588.78 GiB 6000.91 GB)
 Used Dev Size : 2930129920 (2794.39 GiB 3000.45 GB)
 Raid Devices : 3
 Total Devices : 2
 Persistence : Superblock is persistent

Intent Bitmap : Internal

Update Time : Mon Nov 7 20:02:05 2016
 State : clean, degraded
 Active Devices : 2
 Working Devices : 2
 Failed Devices : 0
 Spare Devices : 0

Layout : left-symmetric
 Chunk Size : 512K

Name : homeserver:0 (local to host homeserver)
 UUID : 701632c7:fea9ac94:27ee3748:c5e57242
 Events : 35283

Number Major Minor RaidDevice State
 0 0 0 0 removed
 1 8 33 1 active sync /dev/sdc1
 3 8 49 2 active sync /dev/sdd1
To: root@homeserver.mattionline.lan
Subject: Fail event on /dev/md0:homeserver

This is an automatically generated mail message from mdadm
running on homeserver

A Fail event had been detected on md device /dev/md0.

It could be related to component device /dev/sdb1.

Faithfully yours, etc.

P.S. The /proc/mdstat file currently contains the following:

Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10] 
md0 : active raid5 sdb1[0](F) sdd1[3] sdc1[1]
 5860259840 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [_UU]
 bitmap: 4/22 pages [16KB], 65536KB chunk

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