Here I go, removing an old ZFS dataset that is no longer required. But first, some stats (which have been edited to remove non-zfs output):
[dan@kraken:~] $ df -h Filesystem Size Used Avail Capacity Mounted on storage 1.4T 15G 1.4T 1% /storage storage/bacula.DO.NOT.USE 5.8T 4.4T 1.4T 76% /storage/bacula.DO.NOT.USE storage/compressed 1.4T 49K 1.4T 0% /storage/compressed storage/compressed/bacula 4.4T 3.0T 1.4T 68% /storage/compressed/bacula storage/compressed/home 1.4T 2.7G 1.4T 0% /storage/compressed/home storage/pgsql 1.4T 5.5G 1.4T 0% /storage/pgsql
And the list:
$ zfs list NAME USED AVAIL REFER MOUNTPOINT storage 7.47T 1.41T 14.5G /storage storage/bacula.DO.NOT.USE 4.38T 1.41T 4.38T /storage/bacula.DO.NOT.USE storage/compressed 3.07T 1.41T 49.1K /storage/compressed storage/compressed/bacula 3.07T 1.41T 2.96T /storage/compressed/bacula storage/compressed/home 2.75G 1.41T 2.75G /storage/compressed/home storage/pgsql 5.50G 1.41T 5.50G /storage/pgsql
Now we destroy:
[dan@kraken:~] $ sudo zfs destroy storage/bacula.DO.NOT.USE Password:
And afterwards:
[dan@kraken:~] $ df -h Filesystem Size Used Avail Capacity Mounted on storage 5.8T 15G 5.8T 0% /storage storage/compressed 5.8T 50K 5.8T 0% /storage/compressed storage/compressed/bacula 8.7T 3.0T 5.8T 34% /storage/compressed/bacula storage/compressed/home 5.8T 2.7G 5.8T 0% /storage/compressed/home storage/pgsql 5.8T 5.5G 5.8T 0% /storage/pgsql
And…
[dan@kraken:~] $ zfs list NAME USED AVAIL REFER MOUNTPOINT storage 3.09T 5.79T 14.5G /storage storage/compressed 3.07T 5.79T 49.1K /storage/compressed storage/compressed/bacula 3.07T 5.79T 2.96T /storage/compressed/bacula storage/compressed/home 2.75G 5.79T 2.75G /storage/compressed/home storage/pgsql 5.50G 5.79T 5.50G /storage/pgsql
What I do not understand is why storage was 1.4T available, and is now 5.8T available. The dataset I destroyed was 4.4T used, plug 1.4TB available, gives the 5.8T. Now I see. I was comparing USED with AVAIL and not getting the math right.
