[Bug 791454] Re: RAID1 Test Failed: Device need to be readded manually

[James Page]

It would appear that the swap mirror re-starts OK; the ext4 filesystem
mirrors do not - might be related:

ubuntu at ubuntu:/var/log$ cat /proc/mdstat 
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md1 : active raid1 vda2[0] vdb2[1]
      314356 blocks super 1.2 [2/2] [UU]
      
md2 : active raid1 vda3[0]
      315380 blocks super 1.2 [2/1] [U_]
      
md0 : active raid1 vda1[0]
      1464308 blocks super 1.2 [2/1] [U_]
      
unused devices: <none>
ubuntu at ubuntu:/var/log$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/md0              1.4G  889M  448M  67% /
none                  238M  216K  237M   1% /dev
none                  247M     0  247M   0% /dev/shm
none                  247M   44K  247M   1% /var/run
none                  247M     0  247M   0% /var/lock
/dev/md2              299M   11M  273M   4% /home
ubuntu at ubuntu:/var/log$

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https://bugs.launchpad.net/bugs/791454

Title:
  RAID1 Test Failed: Device need to be readded manually

Status in “mdadm” package in Ubuntu:
  Confirmed
Status in “mdadm” source package in Oneiric:
  Confirmed

Bug description:
  When testing RAID1 on x86 during step 16 'i', after reattaching the
  second disk not all arrays came back.  Two devices needed to be
  readded manually.  Reporting this bug as mentioned in step "i".  I was
  testing using a KVM VM with two qcow2 disk images and virtio.

  If there is any further details I can provide please let me know.

  Same setup failed for x86_64.

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