Fellow Linux Nutjobs! Here is your evening lesson in how to reclaim space from a ZFS partition by destroying snapshots. In my setup, my remote backup has a subset of the snapshots I’m automatically creating from my backup scripts. To reclaim space, I’m deleting those snapshots that have been backed up off-site.
Assume alias Zfs="sudo zfs" in the following example:
Zfs list -rHt snap tank/pictures \ | while read L ; do [[ $L == "tank/pictures@20131008-191254"* ]] && break; echo $L; done \ | cut -d' ' -f1 \ | while read M ; do Zfs destroy $M; done
Pop quiz. What other command could I use besides cut?
And guess what? I typed that command in almost one go, not pasted in from an editor. I’ve formatted it all fancy-like for your precious sanity.