I had a long series of CRC errors where Unraid "fixed" the drives, but when they came back the most of my appdata directories were empty but for a few log files. [not sure why unraid didn't use the parity to fill in the corrupted data]. My appdata backup has been giving repeated errors and not saving containers for a long while and I have been to complacent to figure out what was going wrong. Am I totally screwed and need to rebuild from scratch? THoughts? Diagnostic Logs have pages like this: Feb 6 08:18:07 Tower kernel: XFS (md4p1): Metadata CRC error detected at xfs_agfl_read_verify+0x27/0x60, xfs_agfl block 0x3 Feb 6 08:18:07 Tower kernel: XFS (md4p1): Unmount and run xfs_repair Feb 6 08:18:07 Tower kernel: XFS (md4p1): First 128 bytes of corrupted metadata buffer: Feb 6 08:18:07 Tower kernel: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:07 Tower kernel: XFS (md4p1): metadata I/O error in "xfs_alloc_read_agfl+0x8d/0xf0" at daddr 0x3 len 1 error 74 Feb 6 08:18:07 Tower kernel: XFS (md4p1): page discard on page 00000000a864de33, inode 0x88, pos 0. Feb 6 08:18:08 Tower kernel: XFS (md4p1): Metadata CRC error detected at xfs_agfl_read_verify+0x27/0x60, xfs_agfl block 0x3 Feb 6 08:18:08 Tower kernel: XFS (md4p1): Unmount and run xfs_repair Feb 6 08:18:08 Tower kernel: XFS (md4p1): First 128 bytes of corrupted metadata buffer: Feb 6 08:18:08 Tower kernel: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:08 Tower kernel: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:08 Tower kernel: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:08 Tower kernel: 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:08 Tower kernel: 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:08 Tower kernel: 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:08 Tower kernel: 00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Feb 6 08:18:08 Tower kernel: 00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................