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From: gore@nucsrl.UUCP (Jacob Gore)
Newsgroups: comp.unix.wizards
Subject: Problem in Ultrix 1.2 to 4.3BSD conversion
Message-ID: <3690005@nucsrl.UUCP>
Date: Wed, 10-Jun-87 13:59:21 EDT
Article-I.D.: nucsrl.3690005
Posted: Wed Jun 10 13:59:21 1987
Date-Received: Sat, 20-Jun-87 09:07:48 EDT
Organization: Northwestern U, Evanston IL, USA
Lines: 34

I am trying to bring up 4.3bsd on a MicroVAX II which
is currently running Ultrix 1.2. I made the kernel on a
785 and shipped it to the uVAX via our ethernet.

The problem:  4.3 comes up fine to single user mode. But
when I run /etc/fsck (this is the 4.3 fsck binary), it
complains about
 "BAD SUPER BLOCK: MAGIC NUMBER WRONG
  USE -b OPTION TO FSCK TO SPECIFY LOCATION OF AN ALTERNATE
  SUPER BLOCK TO SUPPLY NEEDED INFORMATION; SEE fsck(8)."

I tried running "fsck -b 32 -y", but that doesn't help. I cannot
mount(8) those file systems either, because /etc/mount complains
about "Bogus Super Block". The surprising thing here is that when
I boot off my ultrix kernel, the ultrix fsck complains about a few
minor things but it does not give the message about a BAD SUPER
BLOCK. I am able to mount those file systems and come up multiuser
in Ultrix, but the 4.3 fsck warns me about BAD SUPER BLOCKs and
refuses to mount file systems.

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).

Thanks in advance for any help.

Jacob Gore
Northwestern University, Computer Science Research Lab
{gargoyle,ihnp4,chinet}!nucsrl!gore
gore@EECS.NWU.Edu (for now, only from ARPA)