Can you salvage any of the lost data though? No backups of the disks at all?
Forum was restored from a daily backup.
See
https://bitcointalk.org/index.php?topic=932315.0 for technical details.
Apparently a pair of SSD died of old age, and/or might be the RAID controller lost its marbles. I have personally seen more RAID arrays die because of the RAID controller (corrupting data, not reporting errors, etc.), than because of multiple disk failures, so that would not be surprising.