hmm. we did a firmware  update on the card as well to the latest available on 
the site. It didnt make a difference.

We suspect its the Seagate Barracuda 1.5TB disks with firmware CCH1.

We have seen them in other systems reverting to 500GB disks (totally odd) - no 
firmware upgrade available on the disks. Seatools (Seagates utility tests fine 
but gives a warning on some of the disks that their firmware needs an upgrade) 
- but none available on their website.

We have hauled all Seagate 1.5TB disks out and replaced with Western Digital 
Green 2TB ones, it now works fine. 

So, we think there is data corruption on the Seagates, caused by the disk 
presenting as 500GB disks, ZFS kernel panics and core dumps because of the 
inconsistency. 

Interestingly, the box booted 100% if we just unplugged the 1.5TB drives. OS 
booted fine and worked. We tried to reimport the 1.5TB disks and it core dumped 
immediately.
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