Upgrading ZFS Storage Pools

If you have ZFS storage pools from a previous Solaris release, you can upgrade your pools with the zpool upgrade command to take advantage of the pool features in the current release. In addition, the zpool status command notifies you when your pools are running older versions. For example:

# zpool status
pool: tank
state: ONLINE
status: The pool is formatted using an older on-disk format.  The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME           STATE     READ  WRITE  CKSUM
tank           ONLINE       0      0      0
   mirror-0    ONLINE       0      0      0
      c1t0d0   ONLINE       0      0      0
      c1t1d0   ONLINE       0      0      0
errors: No known data errors

You can use the following syntax to identify additional information about a particular version and supported releases:

# zpool upgrade -v
This system is currently running ZFS pool version 33.

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
16  stmf property support
17  Triple-parity RAID-Z
18  Snapshot user holds
19  Log device removal
20  Compression using zle (zero-length encoding)
21  Deduplication
22  Received properties
23  Slim ZIL
24  System attributes
25  Improved scrub stats
26  Improved snapshot deletion performance
27  Improved snapshot creation performance
28  Multiple vdev replacements
29  RAID-Z/mirror hybrid allocator
30  Encryption
31  Improved 'zfs list' performance
32  One MB blocksize
33  Improved share support
34  Sharing with inheritance

For more information on a particular version, including supported releases,
see the ZFS Administration Guide.

Then, you can run the zpool upgrade command to upgrade all of your pools. For example:

# zpool upgrade -a