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From: amos@instable.UUCP (Amos Shapir)
Newsgroups: net.unix-wizards
Subject: Re: VAX 785 won't fully boot
Message-ID: <377@instable.UUCP>
Date: Sun, 2-Nov-86 09:42:38 EST
Article-I.D.: instable.377
Posted: Sun Nov  2 09:42:38 1986
Date-Received: Tue, 4-Nov-86 01:35:01 EST
References: <707@ulowell.UUCP>
Reply-To: amos@instable.UUCP (Amos Shapir)
Organization: National Semiconductor (Israel) Ltd.
Lines: 20

We had something similar on a 785 with 4.3 and 2 eagles; the
mchk was in our case (different messages though) due to a memory controller
bug not caught by DEC's diagnostics (try moving memory boards around to
other controllers to prove it!). The mem bug might have caused a bad dma
transfer, and your uda just hit a bad block at a soft spot in the file system;
as it does its own bad block forwarding, you may have ended with a corrupted
file system.
WARNING: do not attempt full restore off a tape created on a corrupted
file system! use only for individual files, and even then *very* cautiously -
bad block appear as 'holes' in the dump, which the restore ignores, thus
getting wrong blocks into files.
I hope this may help (or at least encourage) you in your misery.
	Good Luck - you'll need it
-- 
	Amos Shapir

National Semiconductor (Israel)
6 Maskit st. P.O.B. 3007, Herzlia 46104, Israel
(01-972) 52-522261  amos%nsta@nsc
34.48'E 32.10'N