From owner-freebsd-questions@FreeBSD.ORG  Tue Mar 13 17:54:45 2007
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Date: Tue, 13 Mar 2007 13:54:44 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: David Glassman <david.glassman@kuehne-nagel.com>
Message-ID: <20070313175444.GD9609@xor.obsecurity.org>
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Cc: Sean Bi <sean.bi@kuehne-nagel.com>,
	Robert S Liotta <bob.liotta@kuehne-nagel.com>,
	freebsd-questions@freebsd.org, Steve Sauve <steve.sauve@kn-logistics.com>
Subject: Re: system does not come up after reboot due to devices in /dev
	missing freebsd v3.2
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On Tue, Mar 13, 2007 at 01:07:37PM -0400, David Glassman wrote:
> We have a freebsd 3.2 system and had to reboot it. Afterwards it could
> not fine the following:
> swapon: /dev/da0s1b: No such file or directory
> swapon: /dev/da2s1b: No such file or directory
> Automatic reboot in progress...
> Can't stat /dev/da0s1a: No such file or directory
> Can't stat /dev/da0s1a: No such file or directory
> /dev/da0s1a: CAN'T CHECK FILE SYSTEM.
> /dev/da0s1a: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
> 
> it seems that the above devices disappeared in /dev (See fstab file
> below)and goes into maintenance mode.
> 
> _How do I recover the devices from my fstab file?? Why would they
> suddenly disappear if there was no disk failure??

Only due to disk corruption or explicit removal.

In old versions of FreeBSD you create devices by hand using the
/dev/MAKEDEV script.

Kris