After installing your system, review the ZFS storage pool and ZFS file system information.
Display ZFS storage pool information with the zpool status command.
Display ZFS file system information with the zfs list command.
See Reviewing the Initial ZFS BE After an Installation.
The zpool list and zfs list commands are more improved than the previous df and du commands for determining available pool and file system space. With the legacy commands, you cannot easily discern between pool and file system space, nor do the legacy commands account for space that is consumed by descendant file systems or snapshots.
For example, the following root pool (rpool) has 5.46 GB allocated and 68.5 GB free:
# zpool list rpool NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT rpool 74G 5.46G 68.5G 7% 1.00x ONLINE -
If you compare the pool space accounting with the file system space accounting by reviewing the USED columns of your individual file systems, you can see that the pool space is accounted for. For example:
# zfs list -r rpool NAME USED AVAIL REFER MOUNTPOINT rpool 5.41G 67.4G 74.5K /rpool rpool/ROOT 3.37G 67.4G 31K legacy rpool/ROOT/solaris 3.37G 67.4G 3.07G / rpool/ROOT/solaris/var 302M 67.4G 214M /var rpool/dump 1.01G 67.5G 1000M - rpool/export 97.5K 67.4G 32K /rpool/export rpool/export/home 65.5K 67.4G 32K /rpool/export/home rpool/export/home/admin 33.5K 67.4G 33.5K /rpool/export/home/admin rpool/swap 1.03G 67.5G 1.00G -
The SIZE value that is reported by the zpool list command is generally the amount of physical disk space in the pool, but varies depending on the pool's redundancy level. The zfs list command lists the usable space that is available to file systems, which is disk space minus ZFS pool redundancy metadata overhead, if any. See the following examples for more information.
Non-redundant storage pool – Created with one 136-GB disk, the zpool list command reports SIZE and initial FREE values as 136 GB. The initial AVAIL space reported by the zfs list command is 134 GB, due to a small amount of pool metadata overhead. For example:
# zpool create tank c0t6d0 # zpool list tank NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT tank 136G 95.5K 136G 0% 1.00x ONLINE - # zfs list tank NAME USED AVAIL REFER MOUNTPOINT tank 72K 134G 21K /tank
Mirrored storage pool– Created with two 136-GB disks, the zpool list command reports SIZE as 136 GB and initial FREE value as 136 GB. This reporting is referred to as the deflated space value. The initial AVAIL space reported by the zfs list command is 134 GB, due to a small amount of pool metadata overhead, as shown in the following example:
# zpool create tank mirror c0t6d0 c0t7d0 # zpool list tank NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT tank 136G 95.5K 136G 0% 1.00x ONLINE - # zfs list tank NAME USED AVAIL REFER MOUNTPOINT tank 72K 134G 21K /tank
RAID-Z storage pool – Created with three 136-GB disks, the zpool list commands reports SIZE as 408 GB and initial FREE value as 408 GB. This reporting is referred to as the inflated disk space value, which includes redundancy overhead, such as parity information. The initial AVAIL space reported by the zfs list command is 133 GB, due to the pool redundancy overhead. The following example creates a RAIDZ-2 pool:
# zpool create tank raidz2 c0t6d0 c0t7d0 c0t8d0 # zpool list tank NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT tank 408G 286K 408G 0% 1.00x ONLINE - # zfs list tank NAME USED AVAIL REFER MOUNTPOINT tank 73.2K 133G 20.9K /tank