Ok. An Update:

My system is currently running 151a with a triple-raid-1 mirror for my rpool.
After zpool splitting one disk off, and trying to upgrade. (Sorry -
"pkg update" Alan), that didn't work.

So I spent the next 18 hours re zpool attaching the third disk,
followed by another 12 hours zpool scrub'ing rpool to make sure of no
errors (none found).

I was then able to start again - This time I decided to bite the
bullet and zpool detach a disk, install Solaris 11 on that, and then
zfs send and receive the important stuff from the RAID1 remaining
mirror.

However - this is the intersesting thing - Once I booted from Solaris
11, and tried to import the old rpool disks, it *INSISTS* that it is
corrupt:

root@marvin:~# zpool status rpool
  pool: rpool
 state: ONLINE
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        rpool       ONLINE       0     0     0
          c3t0d0s0  ONLINE       0     0     0

errors: No known data errors
root@marvin:~# zpool import
  pool: rpool
    id: 5245609255954010356
 state: UNAVAIL
status: The pool was last accessed by another system.
action: The pool cannot be imported due to damaged devices or data.
   see: http://www.sun.com/msg/ZFS-8000-EY
config:

        rpool         UNAVAIL  insufficient replicas
          mirror-0    UNAVAIL  insufficient replicas
            c3t1d0s0  UNAVAIL  corrupted data
            c3t2d0s0  UNAVAIL  corrupted data


So - for some weird reason, Solaris 11 doesn't seem to trust the old
rpool at all.

Any ideas how to progress from here?
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