root@myhost:/tank# gzip -9v home.tar
home.tar:        76.7% -- replaced with home.tar.gz
root@myhost:/tank# zpool list
NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
home                   40.8G   2.47M   40.7G     0%  ONLINE     -
tank                   39.8G   1.65M   39.7G     0%  ONLINE     -
root@myhost:/tank# ls -alh
total 1.2M
drwxr-xr-x  2 root sys     3 Feb 14 02:09 .
drwxr-xr-x 28 root root 1.0K Feb 14 01:17 ..
-rw-r--r--  1 root root 1.1M Feb 14 02:09 home.tar.gz
root@myhost:/tank#
root@myhost:/tank# gzip -tv home.tar.gz
home.tar.gz:     OK
root@myhost:/tank#