Hi,
I'm having trouble with my server setup, which contains a BTRFS root partition on top of LVM on top of LUKS partition.
Yesterday server was shut down unexpectedly. I booted the system with a pendrive which contains Debian 4.9.18 and tried to mount the BTRFS root partition manually.
1. cryptsetup luksOpen /dev/sda5
Seems to decrypt the partition (there are no errors)
2. /dev/mapper/foo--vg-root and /dev/mapper/foo--vg-swap_1 is created automatically, so I suppose LVM works correctly.
3. mount -t btrfs /dev/mapper/foo--vg-root /mnt/foo
Gives the following error:
mount: wrong fs type, bad option, bad superblock on ...
4. dmesg | tail Outputs the following:
[17755.840916] sd 3:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[17755.840919] sd 3:0:0:0: [sda] tag#0 CDB: Read(10) 28 00 00 07 c0 02 00 00 02 00
[17755.840921] blk_update_request: I/O error, dev sda, sector 507906
[17755.840941] EXT4-fs (dm-4): unable to read superblock
[18140.052300] sd 3:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[18140.052305] sd 3:0:0:0: [sda] tag#0 CDB: ATA command pass through(16) 85 06 20 00 00 00 00 00 00 00 00 00 00 00 e5 00
[18142.991851] sd 3:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[18142.991856] sd 3:0:0:0: [sda] tag#0 CDB: Read(10) 28 00 00 07 c0 80 00 00 08 00
[18142.991860] blk_update_request: I/O error, dev sda, sector 508032
[18142.991869] Buffer I/O error on dev dm-4, logical block 16, async page read
4.
# btrfs restore -i -D /dev/mapper/foo--vg-root /dev/null
No valid Btrfs found on /dev/mapper/foo--vg-root
Could not open root, trying backup super
No valid Btrfs found on /dev/mapper/foo--vg-root
Could not open root, trying backup super
No valid Btrfs found on /dev/mapper/foo--vg-root
Could not open root, trying backup super
We are pretty sure that no unexpected electric cuts has been happened.
At this point I don't know what information I should supply.