I have a disk set from a
WD Sentinel DX4000 Windows Server 2008 R2 headless based NAS with a failed mainboard.
The disks are 'fine', but I need to figure out how data is laid out on them - ie the RAID parameters (disk order, stripe size, starting disk and direction of rotation for parity blocks) within that RAID set.
I understand that device uses something like "BIOS RAID" with, at least in normal operation, no/not much user configuration possibilities, so three disks would mean RAID5 for sure. With guessed parameters I can read the (GPT) partition table and some filesystem structures, but I haven't gotten close enough yet. The partition table I can see also does make sense for RAID5, it shows 4 TB total for 3x2TB disks.
Does anyone happen to know the on-disk RAID metadata format this device uses? How to identify/read that metadata? Linux'
dmraid does not recognize any metadata on those disks.
Or, which (default) RAID parameters that specific device might use.
Or, any other ideas how to somewhat efficiently figure this out.
Any help is much appreciated, including other places to ask!
