Even after rebooting with the drive for the zpool physically removed
from the system, I still had a zpool I couldn't destroy, export, or
otherwise remove from the listing.

Using "sudo zpool status -Pv" I worked out that my ZFS was actually
expecting to find the data on partition 1 of the drive:

errors: No known data errors

  pool: hub
 state: UNAVAIL
status: One or more devices could not be used because the label is missing 
        or invalid.  There are insufficient replicas for the pool to continue
        functioning.
action: Destroy and re-create the pool from
        a backup source.
   see: http://zfsonlinux.org/msg/ZFS-8000-5E
  scan: none requested
config:

        NAME                                                     STATE     READ 
WRITE CKSUM
        hub                                                      UNAVAIL      0 
    0     0  insufficient replicas
          /dev/disk/by-id/ata-ST6000DM003-2CY186_ZF200PC8-part1  UNAVAIL      0 
    0     0


I'd previously tried symlinking the old device name to the new one, but
I was inspired to try it with just the partition:

[anovak@octagon ~]$ cd /dev/disk/by-id/
[anovak@octagon by-id]$ sudo ln -s 
'usb-Seagate_Backup+_Hub_BK_NA8TQC87-0:0-part1' 
ata-ST6000DM003-2CY186_ZF200PC8-part1

When I did that, the pool immediately came back online, and I was able
to export it to make it go away.

Then I managed to import it under a more stable name with "sudo zpool
import -a -d /dev/disk/by-partuuid/".


I still can't see the drive data in gsmartcontrol, and I still can't spin it 
down, but at least I can now use it.

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https://bugs.launchpad.net/bugs/1774569

Title:
  gsmartcontrol, hdparm, and ZFS all refuse to talk to an apparently
  working Seagate Backup+ Hub drive after upgrade to 18.04

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