zfs discuss - Oct 2009 - OLD pool information visible in "zpool import"

On what is now a live system, I had previously been tinkering with ZFS, 
creating and destroying pools and datasets.

Those old pools still seem to be visible to the system even though I''ve
re-created new pools with new names :

zpool status
   pool: BackupP0
  state: ONLINE
  scrub: none requested
config:

         NAME         STATE     READ WRITE CKSUM
         BackupP0     ONLINE       0     0     0
           raidz2     ONLINE       0     0     0
             c7t6d0   ONLINE       0     0     0
             c7t7d0   ONLINE       0     0     0
             c7t8d0   ONLINE       0     0     0
             c7t9d0   ONLINE       0     0     0
             c7t10d0  ONLINE       0     0     0

errors: No known data errors

   pool: FileserverP0
  state: ONLINE
  scrub: resilver completed after 1h32m with 0 errors on Sat Oct 17 19:28:30 
2009
config:

         NAME        STATE     READ WRITE CKSUM
         FileserverP0  ONLINE       0     0     0
           raidz1    ONLINE       0     0     0
             c7t1d0  ONLINE       0     0     0
             c7t2d0  ONLINE       0     0     0  96.6G resilvered
             c7t3d0  ONLINE       0     0     0
             c7t4d0  ONLINE       0     0     0
             c7t5d0  ONLINE       0     0     0

... all OK.

But :

sudo zpool import
   pool: jakepool
     id: 14464522389710891962
  state: FAULTED
status: The pool was last accessed by another system.
action: The pool cannot be imported due to damaged devices or data.
         The pool may be active on another system, but can be imported using
         the ''-f'' flag.
    see: http://www.sun.com/msg/ZFS-8000-EY
config:

         jakepool      FAULTED  corrupted data
           raidz1      DEGRADED
             /dev/da1  UNAVAIL  cannot open
             c7t3d0s7  ONLINE
             c7t4d0s7  ONLINE
             c7t5d0s7  ONLINE
             c7t9d0s7  ONLINE

   pool: main
     id: 3584812027838379353
  state: UNAVAIL
status: One or more devices are missing from the system.
action: The pool cannot be imported. Attach the missing
         devices and try again.
    see: http://www.sun.com/msg/ZFS-8000-3C
config:

         main           UNAVAIL  insufficient replicas
           raidz2       UNAVAIL  insufficient replicas
             /dev/sdc   UNAVAIL  cannot open
             /dev/sdd   UNAVAIL  cannot open
             /dev/sde   UNAVAIL  cannot open
             c7t10d0s7  ONLINE
             /dev/sdg   UNAVAIL  cannot open


I have to admin that the config here is a *little* strange: The OpenSolaris 
(2009.06) installation is a Xen VM hosted on CentOS.  The reason for this is 
the current lack of SATA Port-Multiplier support on OpenSolaris.  Those old 
pools were created on a previous FreeBSD VM, which was there before 
OpenSolaris.

Any ideas how I can get rid of this old info?


Thanks

Jake