I recently performed an upgrade of our internal DPM servers from DPM 2010 up to DPM 2012 SP1 following my instructions laid out in this post here. Now I have done this successfully on many occasions now but experienced a strange error on the primary DPM server shortly after the upgrade.
One of the protected items which in my case happened to be a C: drive of a server started to fail with an error saying it was inconsistent with the protected data source. The full error was:
DPM could not run the backup/recovery job for the data source because it is owned by a different DPM server.
Owner DPM Server: . (ID 3184 Details: The file or directory is corrupted and unreadable (0x80070570))"
The suggested actions in DPM say to take ownership and then run a synchronisation so I clicked the links to have DPM to this for me and the alerts disappear, but this is not the end as the errors quickly re-appear. After trying this several times and having a search around the Internet for any like minded IT Pros who were having similar problems I was not finding much.
I then was fortunate to stumble across this http://blog.metasplo.it/2013/04/dpm-2012-sp1-replica-inconsistent.html by James Trevaskis which described the problem I was having.
I too found that my looking on the protected content server that was causing the error that in the ActiveOwner folder was these 1kb files and the one relating to the C: drive which was failing was 0kb. I deleted this file and ran the SetDPMServer command and now the backup jobs are successful again and I have a happy DPM server.
I am putting this post out there are not many people have documented this fix yet so hopefully it will serve to help others with the same problems.