I have a Synology NAS using SHR mode, which is basically LVM and Raid 5. Somehow my LVM volume became corrupted and won't mount anymore. This volume houses over 20TB of data, and most of it is NOT backed up -- a lot of irreplaceable data like baby pics and videos, etc.
When I try to mount the volume manually after doing a fsck.ext4, I get the following error in /var/log/messages:
Aug 11 19:01:28 Uranus kernel: [ 816.184841] EXT4-fs (dm-1):
ext4_check_descriptors: Block bitmap for group 163584 not in group
(block 18343897062229723040)!
Aug 11 19:01:28 Uranus kernel: [
816.196072] EXT4-fs (dm-1): group descriptors corrupted!
I just don't know what to do at this point. I think I would have more options available to me if I moved over the 12 drives to a Linux box but that is just not doable for me right now for obvious reasons.
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