zfs problems after rebuilding system [SOLVED]

[Pete French]

Ah, thankyou! I haven;t run current before, but as this is such an issue 
for us I;ll setup an Azure machine running it and have it reboot every 
five minutes or so to check it works OK. Unfortunately the error doesnt 
show up consisntently, as its a race condition. Will let you know if it
fails for any reason.

-pete. [time to take a dive into the exiting world of current]