My motherboard died, so I had to replace it, including the OS.

So I boot first time, do mdadm --assemble --scan, raid assembled without any issues. I share the drive, reboot.

Then it stops recognizing it.

cat /proc/mdstat 
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md127 : inactive sdb[4](S)
      1953511512 blocks super 1.2

unused devices: <none>

The disks are as follows (sdb, sdc, sdd): enter image description here

Why did it work the first time, then stopped working all of a sudden?

If I try to force them, it doesnt work:

sudo mdadm --assemble --force /dev/md127 /dev/sdb /dev/sdc /dev/sdd
mdadm: /dev/sdb is busy - skipping
mdadm: no recogniseable superblock on /dev/sdc
mdadm: /dev/sdc has no superblock - assembly aborted

Any ideas?

  • You haven't really provided enough information to figure out what's wrong. Could you post the results of mdadm --examine /dev/sd{b,c,d}, mdadm --detail /dev/md127, and smartctl -a /dev/sdb, smartctl -a /dev/sdc, and smartctl -a /dev/sdd?
    – Mark
    Feb 7, 2017 at 21:33
  • It's gone, I had to reformat, recreate from scratch...
    – user4921
    Feb 9, 2017 at 18:38


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