zfs destroy snapshot doesn't free space

[Andreas Mayer]

$ uname -a
FreeBSD wurd.dev001.net 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19
02:36:49 UTC 2010
root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

2010/8/13 Malcolm Waltz <mwaltz at pacific.edu>:
> Have you tried "zfs list -t all" ?

I have, it produces this output:
$ zfs list -t all
NAME                           USED  AVAIL  REFER  MOUNTPOINT
rpool                          637G  48,4G    18K  none
rpool/root                     245M  1,76G   209M  legacy
... rpool/root backup snapshots ...
rpool/srv                     5,31G  48,4G  4,94G  /srv
... rpool/srv backup snapshots ...
rpool/tmp                     90,2M  1,91G  90,2M  /tmp
... rpool/tmp backup snapshots ...
rpool/usr                     7,91G  48,4G  6,83G  /usr
... rpool/usr backup snapshots ...
rpool/var                      623G  48,4G   623G  /var

-- 
Best regards
Andreas