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From: amos@instable.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: Problem in Ultrix 1.2 to 4.3BSD conversion
Message-ID: <818@instable.UUCP>
Date: Fri, 12-Jun-87 04:49:26 EDT
Article-I.D.: instable.818
Posted: Fri Jun 12 04:49:26 1987
Date-Received: Sat, 13-Jun-87 20:35:37 EDT
References: <3690005@nucsrl.UUCP>
Reply-To: amos%nsta@nsc.com (Amos Shapir)
Distribution: world
Organization: National Semiconductor (Israel) Ltd. Home of the 32532
Lines: 36
Summary: Watch out for uda drivers
Hdate: 15 Sivan 5747

This problem may be bothering many installations, so I'm posting
rather than replying:

In article <3690005@nucsrl.UUCP> gore@nucsrl.UUCP (Jacob Gore) writes:
>I am trying to bring up 4.3bsd on a MicroVAX II which
>is currently running Ultrix 1.2.
[ Describing not being able to fsck or mount Ultrix's fs on 4.3 ]
>How can I fix this ? Do I have to mkfs those file systems just so
>that I can switch to 4.3 ? I thought that 4.3 file systems and Ultrix
>file systems were compatible (except for directories being a multiple
>of 512 bytes in 4.3).
>
>I get the BAD SUPER BLOCK messages on the g and h partitions of
>an ra81 (hanging off a uda50 controller).

What's incompatible is not the fs, but the uda/ra81 drivers. There are
several versions of these drivers floating around, which differ by the
way the partitions are assigned within the disk. The 4.3 driver has
the sizes and offsets table in the source of uda.c. Some Ultrix versions
(I don't know which) read this information off the disk when opening.

In any case, make sure your new driver aggrees with the old one about that;
it's rather easy to change the table in the 4.3 driver (assuming you have the
source); make sure /etc/disktab is also changed accordingly.

Note also that you cannot have different types of partitioning on one
4.3 system; if you have to, you'll have to define one of them as a new
type of device, with its own driver (which, with little hacking, can be
actually the same driver).

Good Luck - May the Source be with you!
-- 
	Amos Shapir
National Semiconductor (Israel)
6 Maskit st. P.O.B. 3007, Herzlia 46104, Israel  Tel. (972)52-522261
amos%nsta@nsc.com @{hplabs,pyramid,sun,decwrl} 34 48 E / 32 10 N