I recently upgraded two of my CentOS 6 VMs to CentOS 7.3. Both of these utilized ZFS. I installed ZFS using the repos from zfsonlinux.com as I have always done. I do always use the kmod version since I’ve had issues with the dkms version in the past when performing updates. I got my zpools imported just fine, but noticed that after rebooting that I would have to re-import them again. I started investigating this and eventually discovered such a simple solution.