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[Lisio <lisio@xxxxx>]

root@server:~# systemctl status -l zfs-import-cache.service
● zfs-import-cache.service - Import ZFS pools by cache file
   Loaded: loaded (/lib/systemd/system/zfs-import-cache.service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2016-05-15 11:27:46 MSK; 1min 18s ago
  Process: 884 ExecStart=/sbin/zpool import -c /etc/zfs/zpool.cache -aN (code=exited, status=1/FAILURE)
  Process: 781 ExecStartPre=/sbin/modprobe zfs (code=exited, status=0/SUCCESS)
 Main PID: 884 (code=exited, status=1/FAILURE)

May 15 11:27:46 server systemd[1]: Starting Import ZFS pools by cache file...
May 15 11:27:46 server zpool[884]: cannot import 'lxd': no such pool or dataset
May 15 11:27:46 server zpool[884]:         Destroy and re-create the pool from
May 15 11:27:46 server zpool[884]:         a backup source.
May 15 11:27:46 server systemd[1]: zfs-import-cache.service: Main process exited, code=exited, status=1/FAILURE
May 15 11:27:46 server systemd[1]: Failed to start Import ZFS pools by cache file.
May 15 11:27:46 server systemd[1]: zfs-import-cache.service: Unit entered failed state.
May 15 11:27:46 server systemd[1]: zfs-import-cache.service: Failed with result 'exit-code'.

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Packages, which is subscribed to zfs-linux in Ubuntu.
https://bugs.launchpad.net/bugs/1581904

Title:
  File-based pools do not import on boot

Status in zfs-linux package in Ubuntu:
  Confirmed

Bug description:
  System:

  ubuntu: 16.04
  zfsutils-linux: 0.6.5.6-0ubuntu8

  Create sparse files and create pool:

  root@server:/# fallocate -l 100G /web/lxd/100gb.01
  root@server:/# fallocate -l 100G /web/lxd/100gb.02
  root@server:/# zpool create lxd /web/lxd/100gb.01
  root@server:/# zpool add lxd /web/lxd/100gb.02

  Check:

  root@server:/# zpool list
  NAME   SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
  lxc    199G    77K   199G         -     0%     0%  1.00x  ONLINE  -

  After reboot:

  root@server:/etc/apt# zpool list
  no pools available

  Try to create another pool with that files:

  root@server:/# zpool create lxc /web/lxd/100gb.01 /web/lxd/100gb.02
  invalid vdev specification
  use '-f' to override the following errors:
  /web/lxd/100gb.01 is part of potentially active pool 'lxd'
  /web/lxd/100gb.02 is part of potentially active pool 'lxd'

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: zfsutils-linux 0.6.5.6-0ubuntu8
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Sun May 15 05:53:51 2016
  InstallationDate: Installed on 2016-04-21 (23 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: zfs-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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