uq0 being reset

[russ at mays.ucr.edu]

We have a VAXstation II running Ultrix 2.0 with
a TK50, and two RD53 drives (one recently added).
>From time to time console messages appear saying
	Force Error Modifier set LBN ......
	ra1g: hard error sn .....
Lately these have been increasing, so I did a dump
of ra1g, newfs and restore.  The restore died
with
	uq0 being reset
and the system hung. Now I can't do anything
to that disk partition without the system hanging
and the uq0 message appearing.
Any suggestions as to how I can get my disk working
again? Any help appreciated.

Thanks,
Russ Harvey
russ at ucrmath.ucr.edu
{ucsd,uci}!ucrmath!russ