@Rob, from the logs it does appear that you are seeing underlying issues
with the devices and the error is not in ZFS.
For example:
Aug 7 20:59:54 zfs-01 kernel: [26266.626836] blk_update_request: I/O error,
dev sdn, sector 5806167448 op 0x0:(READ) flags 0x700 phys_seg 1 prio class 0
Aug 7 20:59:54 zfs-01 kernel: [26266.628131] zio pool=Red-ZFS-RZ2-3TB
vdev=/dev/sdn1 error=5 type=1 offset=2972756684800 size=24576 flags=1808b0
....
Aug 7 20:59:55 zfs-01 kernel: [26267.374865] sd 2:0:14:0: Power-on or device
reset occurred
Aug 7 20:59:55 zfs-01 kernel: [26267.374882] sd 2:0:14:0: [sdn] tag#5309 Done:
SUCCESS Result: hostbyte=DID_OK driverbyte=DRIVER_OK
Aug 7 20:59:55 zfs-01 kernel: [26267.374888] sd 2:0:14:0: [sdn] tag#5309 CDB:
Read(16) 88 00 00 00 00 01 5a 13 1a f8 00 00 00 58 00 00
Aug 7 20:59:55 zfs-01 kernel: [26267.374894] sd 2:0:14:0: [sdn] tag#5309 Sense
Key : Unit Attention [current]
Aug 7 20:59:55 zfs-01 kernel: [26267.374899] sd 2:0:14:0: [sdn] tag#5309 Add.
Sense: Power on, reset, or bus device reset occurred
So, it may be a physical device error, and/or a combination of issues
with the drive and/or controller. It may be worth double checking the
H/W at this point. It does appear ZFS gets blocked on device failures.
** Changed in: zfs-linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1889110
Title:
zfs pool locks and see "INFO: task txg_sync:4307 blocked for more than
120 seconds. "
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