ZEVO CE 1.1.1 after supposed destruction of a read-only pool

sh-3.2$ zpool import -o readonly=on fourgig
cannot import 'fourgig': no such pool available
sh-3.2$ sudo zpool import -o readonly=on fourgig
cannot import 'fourgig': no such device in pool
	Destroy and re-create the pool from
	a backup source.
sh-3.2$ sudo zpool import
  pool: fourgig
    id: 5691477073133955531
 state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:

	fourgig                                      ONLINE
	  GPTE_4E4E357C-C7ED-4FD4-9B6D-F2358B9C2E03  ONLINE
sh-3.2$ sudo zpool import fourgig
sh-3.2$ zpool status fourgig
  pool: fourgig
 state: ONLINE
 scan: none requested
config:

	NAME                                         STATE     READ WRITE CKSUM
	fourgig                                      ONLINE       0     0     0
	  GPTE_4E4E357C-C7ED-4FD4-9B6D-F2358B9C2E03  ONLINE       0     0     0  at disk11s2

errors: No known data errors
sh-3.2$ zpool export fourgig
sh-3.2$ sudo zpool import -o readonly=on fourgig
sh-3.2$ sudo zpool destroy fourgig
sh-3.2$ sudo zpool import
  pool: fourgig
    id: 5691477073133955531
 state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:

	fourgig                                      ONLINE
	  GPTE_4E4E357C-C7ED-4FD4-9B6D-F2358B9C2E03  ONLINE
sh-3.2$ sudo zpool import fourgig
sh-3.2$ sudo zpool destroy fourgig
sh-3.2$ sudo zpool import
no pools available to import
sh-3.2$ sudo kextstat | grep greenbytes
  109    1 0xffffff7f807a6000 0x19b000   0x19b000   com.getgreenbytes.filesystem.zfs (2012.09.23) <13 7 5 4 3 1>
  110    0 0xffffff7f80943000 0x6000     0x6000     com.getgreenbytes.driver.zfs (2012.09.14) <109 13 7 5 4 3 1>
sh-3.2$