Ubuntu
mdadm package

  1. Bug #557429
  2. Comment #10

Comment 10 for bug 557429

Revision history for this message
ceg (ceg) wrote : Re: booting out of sync RAID1 array fails with ext3 (comes up as already in sync)

> I believe this should fail and refuse to use the second disk until you manually re-add it to the array, causing a full resync.

Yes, if there is a way for mdadm to determine if members are out of sync it should fail on conflicting updates that occured on separated parts of the array (as is the case here).

It should not fail if a usable remaining part of an array has been updated and the removed disk is plugged in again unchanged (hotplug readding of a raid member that is used as a backup).

It should never sync depending on device order (since that is rather random in hotplug systems anyway).