mdadm --detail /dev/md3

/dev/md3:
        Version : 0.90
  Creation Time : Mon Jun  4 01:46:39 2018
     Raid Level : raid1
     Array Size : 95687616 (91.25 GiB 97.98 GB)
  Used Dev Size : 95687616 (91.25 GiB 97.98 GB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 3
    Persistence : Superblock is persistent

    Update Time : Wed Sep 25 11:17:06 2019
          State : active
 Active Devices : 3
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 0

           UUID : da4b84a1:9de53306:a4d2adc2:26fd5302
         Events : 0.197

    Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync   /dev/sda3
       1       8       19        1      active sync   /dev/sdb3
       2       8       35        2      active sync   /dev/sdc3