root@h4:~# mdadm --examine /dev/sd[abcd]
/dev/sda:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 248114fe:41d432a6:fa936149:9686a567
Name : h4:TKRaid (local to host h4)
Creation Time : Sat Oct 31 20:47:11 2020
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3906764976 (1862.89 GiB 2000.26 GB)
Array Size : 5860147200 (5588.67 GiB 6000.79 GB)
Used Dev Size : 3906764800 (1862.89 GiB 2000.26 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=176 sectors
State : clean
Device UUID : d6cc6979:001c92df:a88dda91:c2f51272
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Jul 25 22:28:11 2021
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : bd86b81e - correct
Events : 29648
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdb:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 248114fe:41d432a6:fa936149:9686a567
Name : h4:TKRaid (local to host h4)
Creation Time : Sat Oct 31 20:47:11 2020
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3906764976 (1862.89 GiB 2000.26 GB)
Array Size : 5860147200 (5588.67 GiB 6000.79 GB)
Used Dev Size : 3906764800 (1862.89 GiB 2000.26 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=176 sectors
State : clean
Device UUID : c4c9d9f6:76d18465:13bb5992:85e4d463
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Jul 25 22:28:11 2021
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : b32a86b1 - correct
Events : 29648
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)
mdadm: No md superblock detected on /dev/sdc.
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 248114fe:41d432a6:fa936149:9686a567
Name : h4:TKRaid (local to host h4)
Creation Time : Sat Oct 31 20:47:11 2020
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 3906764976 (1862.89 GiB 2000.26 GB)
Array Size : 5860147200 (5588.67 GiB 6000.79 GB)
Used Dev Size : 3906764800 (1862.89 GiB 2000.26 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=176 sectors
State : clean
Device UUID : 2bf2a3b0:9d3ba028:cb0688d7:c218b918
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Jul 25 22:28:11 2021
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : 2a229932 - correct
Events : 29648
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing)