[Bug 1594634] [NEW] ZFS on iscsi target fails at boot/shutdown

[Rob]

Public bug reported:

I've got a ZFS volume on an ISCSI target, once the system boots I can
bring it online.

My ISCSI target shows up as:

root at test:/home/rob# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0  8.1T  0 disk

root at test:/home/rob# zpool status
  pool: data2
 state: ONLINE
  scan: none requested
config:

	NAME        STATE     READ WRITE CKSUM
	data2       ONLINE       0     0     0
	  sda       ONLINE       0     0     0

errors: No known data errors

root at test:/home/rob# df -h
Filesystem      Size  Used Avail Use% Mounted on
------------------- snip --------------------------
data2           3.1T     0  3.1T   0% /data2
data2/backup    3.2T  165G  3.1T   6% /data2/backup
data2/test     7.7T  4.7T  3.1T  61% /data2/test


However in the case of a system shutdown/reboot the system tries to
unmount the disk after the network has been brought down which obviously
fails.

When booting the system the zpool never gets imported as the 'zfs-
import-cache.service' runs before the iscsi target is initiated.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1594634

Title:
  ZFS on iscsi target fails at boot/shutdown

Status in systemd package in Ubuntu:
  New

Bug description:
  I've got a ZFS volume on an ISCSI target, once the system boots I can
  bring it online.

  My ISCSI target shows up as:

  root at test:/home/rob# lsblk
  NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
  sda      8:0    0  8.1T  0 disk

  root at test:/home/rob# zpool status
    pool: data2
   state: ONLINE
    scan: none requested
  config:

  	NAME        STATE     READ WRITE CKSUM
  	data2       ONLINE       0     0     0
  	  sda       ONLINE       0     0     0

  errors: No known data errors

  root at test:/home/rob# df -h
  Filesystem      Size  Used Avail Use% Mounted on
  ------------------- snip --------------------------
  data2           3.1T     0  3.1T   0% /data2
  data2/backup    3.2T  165G  3.1T   6% /data2/backup
  data2/test     7.7T  4.7T  3.1T  61% /data2/test


  However in the case of a system shutdown/reboot the system tries to
  unmount the disk after the network has been brought down which
  obviously fails.

  When booting the system the zpool never gets imported as the 'zfs-
  import-cache.service' runs before the iscsi target is initiated.

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