ZFS Fails After Xubuntu Version Upgrade

Basically, the pools were showing critical errors after upgrading from Xubuntu 12.04 to 14.04 like this:

pool: mediatank
  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
        mediatank                                     UNAVAIL      0     0     0  insufficient replicas
          mirror-0                                    UNAVAIL      0     0     0  insufficient replicas
            scsi-SATA_Hitachi_HDS7220_JK11B1B9HXYAWF  UNAVAIL      0     0     0
            scsi-SATA_Hitachi_HDS7220_JK2171B9HYRASL  UNAVAIL      0     0     0

  pool: tank
  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
        tank                                     UNAVAIL      0     0     0  insufficient replicas
          mirror-0                               UNAVAIL      0     0     0  insufficient replicas
            scsi-SATA_TOSHIBA_DT01ACA_14TRP11GS  UNAVAIL      0     0     0
            scsi-SATA_TOSHIBA_DT01ACA_14TRRNVGS  UNAVAIL      0     0     0

Turns out, the new kernel changed the way it refers to these devices. Instead of

scsi-SATA_TOSHIBA_DT01ACA_14TRP11GS

for instance, the new name is

ata-SATA_TOSHIBA_DT01ACA_14TRP11GS

GRRR.

Anyway, after looking at a couple of sites that said I needed to use symlinks to the old names in the /dev/disk/by-id folder, I found this fix:

sudo zpool export backups
sudo import -d /dev/disk/by-id/ backups -f

Thanks to the Blog of Graham.