Hanging VAX 11/780 - any solutions?

[Yoon Kim]

Our VAX 11/780 running 4.2BSD hangs once in a while.  It barely
stays up over 2 days.  The symptom is that terminals begin to hang
one by one.  And then the whole system is hung somewhere.  Has anyone
suffered similar/same problems?  Any solutions for me?  Any ways of
diagnosting?

yOOn
hplabs!kaist!yoonkim

P.S.  We have SI disk controller 9800 and two CDC's 9766 drivers
	linked to it.