Problem Booting (Bad Super Block)
m.seaman at infracaninophile.co.uk
Fri Nov 28 02:13:38 PST 2003
On Fri, Nov 28, 2003 at 12:56:02AM -0800, Rishi Chopra wrote:
> I've started having problems on my FreeBSD box; I've installed FreeBSD
> on this system at least 5 times before without any problems.
> This time, the installation took many attempts, and the following error
> message occurs when I attempt to boot up:
> /dev/da0s1a: BAD SUPER BLOCK: VALUES IN SUPER BLOCK DISAGREE WITH
> THOSE IN FIRST ALTERNATE
> /dev/da0s1a: UNEXPECTED INCONSISTENCY: RUN fsck MANUALLY
> Automatic file system check then fail, the boot process aborts, and the
> system starts in single user mode.
> How can I fix this error so that the machine boots normally? I am
> unable to run fsck from the prompt by just typing 'fsck'....
First thing you have to do is run fsck manually, like it says:
# /sbin/fsck -y /dev/da0s1a
With luck, this will fix the problems with your filesystem. Now, make
sure that the rest of your filesystems are clean:
# /sbin/fsck -p
and then you should be able to reboot successfully.
If you can't run /sbin/fsck then you must be running FreeBSD 5.x with
the dynamic root patches. In this case, there should be a statically
linked copy of fsck in /recover (? -- can't remember exactly what
directory is used, but it's something like that).
The question remains as to why you're seeing this problem. There are
3 obvious possibilities I can think of:
i) You didn't shut down cleanly -- however, normally the automatic
fsck on reboot should clear up any problems. If you're
exceedingly unlucky, you might kill the system right in the
middle of a critical operation and leave the disk in a nasty
state leading to the effects you've seen. In this case, once
you've cleared up this time, you shouldn't suffer from the
ii) Your disk is failing.
iii) You've got (or once had) FreeBSD 5.x installed on the same
system and you mount your 4.x partitions under 5.x -- there
have been changes to the superblock format in UFS1 between 4.x
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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