$ sudo mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Sat Jan 9 15:52:00 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 15:52:21 2021 State : clean, resyncing Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Consistency Policy : bitmap Resync Status : 1% complete Name : dev-machine:0 (local to host dev-machine) UUID : 833033c5:cd9b78de:992202ee:cb1bf77f Events : 4 Number Major Minor RaidDevice State 0 259 2 0 active sync /dev/nvme0n1p1 1 8 33 1 active sync writemostly /dev/sdc1