I have a 6 disk RAID 6 that is no longer working following a reboot. 3 of the disks seem to be ok, but the remaining 3 disks don't even show the correct partition type ( through 'fdisk -l') and likewise claim to have no superblocks (when trying 'mdadm --assemble'). Running blkid shows 3 disks with the correct UUID, Label, and type, but the three remaining disks with only varying PTUUIDs and a PTTYPE of 'gpt'. I've scoured Google and can't seem to find anything similar that's happened to anyone else. Using testdisk, I can see that pieces are intact, so I suspect it is recoverable, but have no idea where to begin.
And yes, I know the first response should be "Restore from backups!" sadly, that's not an option in this case as I haven't made any in some time. (Bad sysadmin!)
Any ideas on where I should begin? I may even be willing to pay for some assistance on this.