ZFS folders on Ubuntu 14.04 LTS not mounting after reboot

Problem

On Ubuntu 14.04 LTS, I installed a ZFS ZPOOL following these instructions.

After a restarting my machine however, the zpools failed to mount. I couldn't see any apparent errors from checking the logs.

Solution

Attempt #1

Executing the following command actually mounts the zpool as desired. We could execute this script on startup (but we shouldn't have to).

zpool import -a

Attempt #2

Apparently setting/adding the following properties automatically mounts the zpool. This didn't work for me (my version of zfs).

File: /etc/default/zfs

ZFS_MOUNT='yes'
ZFS_UNMOUNT='yes'

Attempt #3

Other solutions suggest adding a sleep to the following file:

File: /etc/init/mountall.conf

I didn't even bother trying this though.

Attempt #4 (Success)

I came across the following zpool config file, and tried changing the value for zfs_autoimport_disable from 1 to 0.

File: /etc/init/zpool-import.conf

modprobe zfs zfs_autoimport_disable=0

After a restart, my zpools were imported (success!). Then, to automatically mount the zfs mounts, I had to add the following line:

File: /etc/rc.local

zfs mount -a

Not sure why this value is defaulted to 1, but changing it to 0 worked for me.