After power-cycling a Dell R720 with PERC H710 Mini RAID controller, it lost one of 2 RAID volumes I had configured. The RAID configuration utility now shows the drives as "unconfigured", rather than "foreign". How can I recover or reconstruct the original volume?
During boot, I got an error message that the volume was missing. I powered off and unplugged the machine, to manually inspect all the internal connections and reinsert the drives. After doing this 2-3 times, I finally entered the configuration utility so I could at least see which drives were missing and possibly re-import the volume as a foreign config.
However, once I entered the configuration utility, the visible drives that had been in the volume didn't show up as foreign, but instead showed as unconfigured. The foreign config menu is also greyed out.
Just a day before, I had completed a consistency check of the volume, so the disks themselves are fine. Once in the RAID utility, I reinserted the drives that were missing and the controller managed to see them. I know the contents of the RAID is still on the drives. If I create a new volume, it'll overwrite them. Is there any way to reconstruct the volume without wiping the data? If not, is there any software I can use that will allow me to mount the drives and recover the contents?
BTW, the controller has the "auto-import" setting disabled.
