$ sudo mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Sat Jan 9 15:22:29 2021 Raid Level : raid1 Array Size : 244065408 (232.76 GiB 249.92 GB) Used Dev Size : 244065408 (232.76 GiB 249.92 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Sat Jan 9 15:24:20 2021 State : clean, resyncing Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Consistency Policy : bitmap Resync Status : 9% complete Name : dev-machine:0 (local to host dev-machine) UUID : a84b0db5:8a716c6d:ce1e9ca6:8265de17 Events : 22 Number Major Minor RaidDevice State 0 8 33 0 active sync /dev/sdc1 1 8 49 1 active sync /dev/sdd1