Just upgraded my work mac to Leopard. Took an hour, worked flawlessly.

Of course, the first thing I did was stick in a USB stick with holds half a zpool from my Solaris Express box at home:

  planb:~ $ zpool import
    pool: sticky
      id: 4692054964394431575
   state: FAULTED
  status: The pool is formatted using an incompatible version.
  action: The pool cannot be imported.
  Access the pool on a system running newer
    software, or recreate the pool from backup.
   see: http://www.sun.com/msg/ZFS-8000-A5
config:

    sticky          UNAVAIL   newer version
      mirror        DEGRADED
        dsk/c6t0d0  UNAVAIL   cannot open
        disk3       ONLINE
planb:~ $ zpool import sticky
cannot import 'sticky': pool is formatted using a newer ZFS version

i.e. ” I know this is half of a mirror, but it’s a newer ZFS version than Apples”.

what’s new pussycat?

So I reformatted the disk on my Solaris 10 update 4 box:

vera / # rmformat
Looking for devices...
...
...
     3. Volmgt Node: /vol/dev/aliases/rmdisk0
        Logical Node: /dev/rdsk/c4t0d0p0
        Physical Node: /pci@0,0/pci8086,4c43@1d,7/storage@7/disk@0,0
        Connected Device: Kingston DataTraveler 2.0 PMAP
        Device Type: Removable
vera / # zpool create sticky c4t0d0p0

This is how it looks on Solaris 10:

vera / # zpool status sticky
  pool: sticky
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        sticky      ONLINE       0     0     0
          c4t0d0p0  ONLINE       0     0     0

errors: No known data errors
vera / # zfs list /sticky
NAME     USED  AVAIL  REFER  MOUNTPOINT
sticky    85K  1.87G  24.5K  /sticky

So I copied a bit of data on, zpool exported and stuck it back in the Mac.

planb:~ $ zpool import sticky
planb:~ $ zpool status
  pool: sticky
 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
    sticky      ONLINE       0     0     0
      disk3     ONLINE       0     0     0

errors: No known data errors
planb:~ $ zfs list
NAME     USED  AVAIL  REFER  MOUNTPOINT
sticky  30.8M  1.84G  30.7M  /Volumes/sticky
planb:~ $ ls -l /Volumes/sticky/
total 3
dr-xr-xr-x+ 4 root  sys  6  7 Nov 00:10 local
planb:~ $ touch /Volumes/sticky/bummer
touch: /Volumes/sticky/bummer: Read-only file system

Much better.

pussy galore

Now for the crazy conspicacy theory bit:

planb:~ $ zpool get all sticky
cannot get property 'name': pool must be upgraded to support pool properties
cannot get property 'bootfs': pool must be upgraded to support pool properties
cannot get property 'bootfs': pool must be upgraded to support pool properties

i.e. “this zpool format doesn’t support bootable volumes. but I do.”