Zfs: Systemd doesn't activate the pool after upgrade to 0.6.5.8

[henryx]

On Fedora 23, after upgrade from 0.6.5.7 to 0.6.5.8 the pool doesn't activate. Problem is located in two causes:

• Unit files are disabled.
• Existence of /etc/zfs/zpool.cache file.

In particular, the second problem emerges after enabling the zfs-import-scan.service unit file. A systemctl status zfs-import-scan.service report this:

Condition: start condition failed at Sat 2016-09-17 14:21:12 CEST; 6s ago
           ConditionPathExists=!/etc/zfs/zpool.cache was not met

Sep 17 14:17:06 alice.wonderland.home systemd[1]: Started Import ZFS pools by device scanning.
Sep 17 14:21:12 alice.wonderland.home systemd[1]: Started Import ZFS pools by device scanning.

[behlendorf]

You'll want to reset the presets as described in the release notes:

https://github.com/zfsonlinux/zfs/releases/tag/zfs-0.6.5.8

[stapler117]

I had the same issue as @henryx and resetting the presets like @behlendorf said fixed my problem.

[henryx]

Currently I've solved "by hand". What leaves me perplexed, however, it he message of systemctl status zfs-import-scan.service. Can reset of presets solve it?

[deajan]

Reset of presets won't solve this.
As far as i understand, zfs-import-scan supposes that zfs-import-cache doesn't have any cache info.
You should enable either import scan or import cache service.
Please correct me if I'm wrong :)

[behlendorf]

@deajan yes you're right. One of these methods needs to be enabled, resetting the presets will enable the zfs-import-cache service which does presume your cache file contains a pool. If that's not going to be the case for your configuration enable the scan service instead and disable the cache service.