$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sde1[4] sdb1[0] sdc1[1] sdd[5]
17581166592 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
bitmap: 0/44 pages [0KB], 65536KB chunk
unused devices:
$ mdadm --detail --scan
ARRAY /dev/md/0 metadata=1.2 name=faulhorn:0 UUID=10373e04:bf6b0e0c:544f5700:689d16f4
$ mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sat Dec 29 19:56:29 2018
Raid Level : raid5
Array Size : 17581166592 (16.37 TiB 18.00 TB)
Used Dev Size : 5860388864 (5.46 TiB 6.00 TB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Wed Sep 14 13:07:04 2022
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : bitmap
Name : faulhorn:0 (local to host faulhorn)
UUID : 10373e04:bf6b0e0c:544f5700:689d16f4
Events : 83351
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
5 8 48 2 active sync /dev/sdd
4 8 65 3 active sync /dev/sde1