I have two ZFS mount points/a ZFS pool in a FreeBSD 12.0 server, that I can see with df:
$ df -h | grep zroot
zroot/vms 196G 657M 195G 0% /vms
zroot 195G 19K 195G 0% /zroot
How can I know in which partition it is located? Can I know a little more about it?
You can know more about your ZFS pool with several commands:
$zpool status
pool: zroot
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
nvd0p4 ONLINE 0 0 0
errors: No known data errors
As you can see, a ZFS pool zroot was created in the nvd0p4 partition.
You can also get a few more glimpses about the characteristics of the pool with the command zpool list:
$zpool list
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
zroot 202G 657M 201G - 0% 0% 1.00x ONLINE -
As root, you can also see the history of the ZFS pool usage:
$sudo zpool history
History for 'zroot':
2017-01-16.22:00:43 zpool create zroot /dev/nvd0p4
2017-01-16.22:48:59 zfs create -V16G -o volmode=dev zroot/linuxdisk0
2017-01-16.22:49:33 zfs destroy zroot/linuxdisk0
2017-01-17.20:59:04 zfs create -o mountpoint=/vms zroot/vms
2017-01-17.21:21:35 zfs create zroot/vms/testvm
2017-01-17.21:21:40 zfs create -sV 16G -o volmode=dev zroot/vms/testvm/disk0
2017-01-17.21:23:41 zfs destroy -rf zroot/vms/testvm
2017-01-30.22:24:59 zfs create zroot/vms/testvm
2017-01-30.22:25:04 zfs create -sV 16G -o volmode=dev zroot/vms/testvm/disk0
2017-01-30.22:35:15 zfs destroy -rf zroot/vms/testvm
You can also list the mounted ZFS filesystems:
$ zfs mount
zroot/vms /vms
zroot /zroot
ZFS has also support for snapshots, jails, and much more. See man zfs and man zpool for more details.
See also ZFS Tutorials : Creating ZFS pools and file systems
