Display Universally Unique Identifiers (UUID) for Linux Software RAID devices.

$ sudo mdadm  --detail --scan

ARRAY /dev/md1 metadata=1.2 name=pxe-rescue:1 UUID=5eb8cf98:a8d13c2e:3e91b4ca:2e1ac678
ARRAY /dev/md0 metadata=1.2 name=pxe-rescue:0 UUID=a69ca2d5:902fc179:787bbdd3:be2c721f

Display details of Linux Software RAID device to display its UUID.

$ sudo mdadm --detail /dev/md0

/dev/md0:
           Version : 1.2
     Creation Time : Mon May  2 18:57:50 2022
        Raid Level : raid1
        Array Size : 960806720 (916.30 GiB 983.87 GB)
     Used Dev Size : 960806720 (916.30 GiB 983.87 GB)
      Raid Devices : 2
     Total Devices : 1
       Persistence : Superblock is persistent

       Update Time : Sat May 21 15:54:43 2022
             State : active, degraded 
    Active Devices : 1
   Working Devices : 1
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : resync

              Name : pxe-rescue:0
              UUID : a69ca2d5:902fc179:787bbdd3:be2c721f
            Events : 46592

    Number   Major   Minor   RaidDevice State
       -       0        0        0      removed
       1       8       18        1      active sync   /dev/sdb2

$ sudo mdadm --detail /dev/md1

/dev/md1:
           Version : 1.2
     Creation Time : Mon May  2 18:57:50 2022
        Raid Level : raid1
        Array Size : 15813504 (15.08 GiB 16.19 GB)
     Used Dev Size : 15813504 (15.08 GiB 16.19 GB)
      Raid Devices : 2
     Total Devices : 1
       Persistence : Superblock is persistent

       Update Time : Sat May 21 16:44:26 2022
             State : clean, degraded 
    Active Devices : 1
   Working Devices : 1
    Failed Devices : 0
     Spare Devices : 0

Consistency Policy : resync

              Name : pxe-rescue:1
              UUID : 5eb8cf98:a8d13c2e:3e91b4ca:2e1ac678
            Events : 29

    Number   Major   Minor   RaidDevice State
       -       0        0        0      removed
       1       8       19        1      active sync   /dev/sdb3

List block devices to determine UUIDs.

$ lsblk --output name,fstype,uuid --exclude 7

NAME    FSTYPE            UUID
sda
|-sda1
|-sda2  linux_raid_member a69ca2d5-902f-c179-787b-bdd3be2c721f
`-sda3  linux_raid_member 5eb8cf98-a8d1-3c2e-3e91-b4ca2e1ac678
sdb                       
|-sdb1                    
|-sdb2  linux_raid_member a69ca2d5-902f-c179-787b-bdd3be2c721f
| `-md0 ext4              a7285c7f-0608-41c6-b588-ab6d18b52003
`-sdb3  linux_raid_member 5eb8cf98-a8d1-3c2e-3e91-b4ca2e1ac678
  `-md1 swap              85f660c1-e58f-46d8-82e0-18d3e2bb2bf4
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