Re-adding the drives to the arrays

The /dev/sdb disk seems to be functional and, outside the event count difference, we cannot see any reason the RAID would reject the devices. Our next step will be an attempt to re-add the removed devices to their RAID arrays.

The first RAID we will attempt this with is /dev/md127:

[nfs]# mdadm --detail /dev/md127
/dev/md127:
        Version : 1.0
  Creation Time : Wed Apr 15 09:39:22 2015
     Raid Level : raid1
     Array Size : 511936 (500.02 MiB 524.22 MB)
  Used Dev Size : 511936 (500.02 MiB 524.22 MB)
   Raid Devices : 2
  Total Devices : 1
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Mon May 11 04:08:10 2015
          State : clean, degraded 
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           Name : localhost:boot
           UUID : 7adf0323:b0962394:387e6cd0:b2914469
         Events : 60

    Number   Major   Minor   RaidDevice State
       0       8        1   ...