sd 6:0:0:0: [sdb] Unaligned partial completion (resid=12, sector_sz=512)

[Christoph Anton Mitterer]

Hey.

I'm seeing these errors:
Jun 09 21:13:22 heisenberg kernel: sd 6:0:0:0: [sdb] Unaligned partial completion (resid=16, sector_sz=512)
Jun 09 21:13:22 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Jun 09 21:13:22 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 Sense Key : Medium Error [current] 
Jun 09 21:13:22 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 Add. Sense: Unrecovered read error
Jun 09 21:13:22 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 CDB: Read(16) 88 00 00 00 00 01 cd e6 de 40 00 00 00 e0 00 00
Jun 09 21:13:22 heisenberg kernel: print_req_error: critical medium error, dev sdb, sector 7749426752
Jun 09 21:13:31 heisenberg kernel: sd 6:0:0:0: [sdb] Unaligned partial completion (resid=12, sector_sz=512)
Jun 09 21:13:31 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Jun 09 21:13:31 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 Sense Key : Medium Error [current] 
Jun 09 21:13:31 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 Add. Sense: Unrecovered read error
Jun 09 21:13:31 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 CDB: Read(16) 88 00 00 00 00 00 00 14 59 60 00 00 01 00 00 00
Jun 09 21:13:31 heisenberg kernel: print_req_error: critical medium error, dev sdb, sector 1333600
Jun 09 21:13:53 heisenberg kernel: sd 6:0:0:0: [sdb] Unaligned partial completion (resid=12, sector_sz=512)
Jun 09 21:13:53 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Jun 09 21:13:53 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 Sense Key : Medium Error [current] 
Jun 09 21:13:53 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 Add. Sense: Unrecovered read error
Jun 09 21:13:53 heisenberg kernel: sd 6:0:0:0: [sdb] tag#0 CDB: Read(16) 88 00 00 00 00 00 c3 a2 56 80 00 00 01 00 00 00
Jun 09 21:13:53 heisenberg kernel: print_req_error: critical medium error, dev sdb, sector 3282196096

(many of them) on a Seagate 8TB Archive HDD.
The disk is only a year old and barely used (since it's just one of the
backups of my main data disks - and the primary disk another Seagate
8TB HDD broke just few days ago).

I have connected them via USB/SATA bridge... and when I now started
copying from the backup (which is sdb) to a fresh HDD I started seeing
vast numbers of these errors.

However, fsck, cp seem to do fine, and the data (as far as it has been
copied) seems good (I have sha512 sums of all of it).


Any ideas what "Unaligned partial completion" and these errors mean?


Thanks,
Chris.