How to do a recovery of a degraded RAID1

[Phillip Susi]

Phillip Susi wrote:
> Once the system is up and running, the kernel should copy the primary 
> drive's contents to the secondary one's over time.  Eventually they will 
> actually be in sync and used normally, but currently there is no process 
> to update the metadata on disk.  I would say break out a hex editor and 
> modify the metadata to indicate that the array is in a clean state.


Actually, now that I think about it... something seems off... my 
understanding was that dmraid currently never updates the on disk 
metadata, but if that is the case, then how can the disks stay in sync 
in the face of a crash?  If one disk gets updated and then the power 
fails, when the system restarts, it has no way of knowing that one of 
the disks is out of sync.