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[Richard Laager <rlaager@xxxxxxxxxx>]

Does this import the pool:
sudo zpool import -c /etc/zfs/zpool.cache -aN

If so, is "/web/lxd" and/or "/web" a separate filesystem from "/"?

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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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