Hi I had a system crash. When it came back up, one of my arrays was degraded: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdd[0] 1953514496 blocks [2/1] [U_] md1 : active raid0 sdc[1] sdb[0] 1953524736 blocks super 1.2 512k chunks unused devices: <none> md1 is supposed to be a member of md0 but it's not currently: /dev/md0: Version : 0.90 Creation Time : Mon Jan 26 19:51:38 2009 Raid Level : raid1 Array Size : 1953514496 (1863.02 GiB 2000.40 GB) Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Apr 7 08:19:25 2016 State : clean, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 UUID : 2f8fc5e0:a0eb646a:2303d005:33f25f21 Events : 0.5030755 Number Major Minor RaidDevice State 0 8 48 0 active sync /dev/sdd 1 0 0 1 removed It doesn't seem to be re-addable: # mdadm --stop /dev/md0 mdadm: stopped /dev/md0 # mdadm --manage /dev/md0 --re-add /dev/md1 mdadm: --re-add for /dev/md1 to /dev/md0 is not possible It doesn't seem to be assemble-able: # mdadm --stop /dev/md0 mdadm: stopped /dev/md0 # mdadm --assemble /dev/md0 /dev/sdd /dev/md1 mdadm: /dev/md0 has been started with 1 drive (out of 2). even when forced: # mdadm --stop /dev/md0 mdadm: stopped /dev/md0 # mdadm --assemble --force /dev/md0 /dev/sdd /dev/md1 mdadm: /dev/md0 has been started with 1 drive (out of 2). Is my only option here to fail/remove /dev/md1 from the array and re- add it that way or is there a more graceful recovery possible here? Some additional info: mdadm --examine /dev/md1 /dev/md1: Magic : a92b4efc Version : 0.90.00 UUID : 2f8fc5e0:a0eb646a:2303d005:33f25f21 Creation Time : Mon Jan 26 19:51:38 2009 Raid Level : raid1 Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Array Size : 1953514496 (1863.02 GiB 2000.40 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Thu Apr 7 00:18:47 2016 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : e5ddeac5 - correct Events : 5030737 Number Major Minor RaidDevice State this 1 9 1 1 active sync /dev/md1 0 0 8 48 0 active sync /dev/sdd 1 1 9 1 1 active sync /dev/md1 # mdadm --examine /dev/sdd /dev/sdd: Magic : a92b4efc Version : 0.90.00 UUID : 2f8fc5e0:a0eb646a:2303d005:33f25f21 Creation Time : Mon Jan 26 19:51:38 2009 Raid Level : raid1 Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) Array Size : 1953514496 (1863.02 GiB 2000.40 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 0 Update Time : Thu Apr 7 08:37:04 2016 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : e62b232b - correct Events : 5030757 Number Major Minor RaidDevice State this 0 8 48 0 active sync /dev/sdd 0 0 8 48 0 active sync /dev/sdd 1 1 0 0 1 faulty removed Most happy to provide any additional information needed. Cheers, b.
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