>    The basic system installed fine (and *very* quickly!) but now I'm 
> trying to untar a big pile of stuff (tar file on the FC-AL array, 
> untarring to an empty filesystem on the system disk on the ISP1020) and 
> am seeing periodic hard hangs...the only thing I've been able to do is 
> hit reset.
>    Has anyone else seen this?  I'm about to boot a non-MP kernel to see 
> if the behavior changes.

Dave - I've also seen this on four of our API CS20 and moving to a non-MP
kernel has stablized them for the most part (there is another issue I'm
working at getting more info about, but its not MP related).

There is a patch for pmap which may help you out.. .but from what I've ready
from private emails, MP is still considered experimental.