root@srv{~}> zpool status
  pool: rpool
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        rpool       ONLINE       0     0     0
          mirror    ONLINE       0     0     0
            c1d0s0  ONLINE       0     0     0
            c2d0s0  ONLINE       0     0     0

errors: No known data errors

  pool: zd1
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        zd1         ONLINE       0     0     0
          raidz1    ONLINE       0     0     0
            c0t0d0  ONLINE       0     0     0
            c0t1d0  ONLINE       0     0     0
            c0t2d0  ONLINE       0     0     0
            c0t3d0  ONLINE       0     0     0
            c0t4d0  ONLINE       0     0     0
            c0t5d0  ONLINE       0     0     0

errors: No known data errors




root@srv{~}> zfs list -r rpool
NAME                           USED  AVAIL  REFER  MOUNTPOINT
rpool                         14.1G  95.2G  41.5K  /rpool
rpool/ROOT                    4.66G  95.2G    18K  legacy
rpool/ROOT/s10                4.66G  95.2G  3.83G  /
rpool/ROOT/s10/var             850M  95.2G   850M  /var
rpool/dump                    2.00G  95.2G  2.00G  -
rpool/export                   130K  95.2G    21K  /export
rpool/export/home              109K  95.2G    25K  /export/home
rpool/export/home/edo           21K  95.2G    21K  /export/home/edo
rpool/swap                       4G  99.2G    16K  -
rpool/virtualbox              2.91G  95.2G  53.5K  /virtualbox
rpool/virtualbox/disks        2.91G  95.2G    24K  /virtualbox/disks
rpool/virtualbox/disks/IPCop  2.12G  95.2G  2.12G  /virtualbox/disks/IPCop
rpool/virtualbox/disks/YAMJ    806M  95.2G   806M  /virtualbox/disks/YAMJ
rpool/virtualbox/vm            164K  95.2G    24K  /virtualbox/vm
rpool/virtualbox/vm/IPCop     24.5K  95.2G  24.5K  /virtualbox/vm/IPCop
rpool/virtualbox/vm/YAMJ       116K  95.2G   116K  /virtualbox/vm/YAMJ



root@srv{~}> zpool upgrade
This system is currently running ZFS pool version 15.

All pools are formatted using this version.
root@srv{~}> zpool upgrade -v
This system is currently running ZFS pool version 15.

The following versions are supported:

VER  DESCRIPTION
---  --------------------------------------------------------
 1   Initial ZFS version
 2   Ditto blocks (replicated metadata)
 3   Hot spares and double parity RAID-Z
 4   zpool history
 5   Compression using the gzip algorithm
 6   bootfs pool property
 7   Separate intent log devices
 8   Delegated administration
 9   refquota and refreservation properties
 10  Cache devices
 11  Improved scrub performance
 12  Snapshot properties
 13  snapused property
 14  passthrough-x aclinherit
 15  user/group space accounting
For more information on a particular version, including supported releases, see:

http://www.opensolaris.org/os/community/zfs/version/N

Where 'N' is the version number.