*BSD News Article 39203


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From: richard@cogsci.ed.ac.uk (Richard Tobin)
Subject: Sharing partitions between FreeBSD 1.1.5.1 and 2.0
Message-ID: <D0Hy2E.2E9@cogsci.ed.ac.uk>
Organization: HCRC, University of Edinburgh
Date: Thu, 8 Dec 1994 14:39:50 GMT
Lines: 29

I'm sure this must have already been asked, but I guess it must have
expired :-(

I have both FreeBSD 1.1.5.1 and 2.0 installed on my machine, and plan
to continue using both for a while.  I'm using the old-style
filesystems so that both versions can use them.  If I boot 1.1.5.1
after 2.0, fsck says:

  BAD SUPER BLOCK: VALUES IN SUPERBLOCK DISAGREE WITH THOSE IN
  FIRST ALTERNATE

If I run fsck by hand, it happily uses the values in the alternate
block (32).

I guess that this is because of the clean flag in the super-block -
is that right?

So:

- is there a fix?
- is it safe to use the filesystems un-fsck'd under 1.1.5.1 (that is,
  as safe as usual)?

-- Richard
-- 
Satan himself, in a sermon preached from the pulpit of North Berwick
church, comforted his many servants by assuring them that no harm could
befall them "sa lang as their hair wes on, an sould newir latt ane teir
fall fra thair ene".                    - J G Frazer, The Golden Bough