Date: Wed, 27 Nov 2002 23:53:33 -0800 From: Kirk McKusick <mckusick@beastie.mckusick.com> To: Daniel Flickinger <attila@hun.org> Cc: FreeBSD-CURRENT <current@freebsd.org> Subject: Re: UFS-2 partition destroyed by change Message-ID: <200211280753.gAS7rX59074517@beastie.mckusick.com> In-Reply-To: Your message of "Thu, 28 Nov 2002 06:01:36 GMT." <20021128060136.znoK8944@hun.org>
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If I understand correctly, you ran a new fsck on a UFS-2 that
had not yet been mounted by your new kernel. Thus you had a
version of fsck that expected a converted UFS-2 filesystem
that you had not yet converted (by mounting with the new kernel).
I would have expected it to fail with a bad superblock magic
number. Had you mounted it before running the new fsck, all would
have been well. I am at a loss to explain why fsck did not gag
and refuse to check it though.
Kirk McKusick
=-=-=-=-=
Date: Thu, 28 Nov 2002 06:01:36 +0000 (GMT)
From: Daniel Flickinger <attila@hun.org>
To: FreeBSD-CURRENT <current@freebsd.org>
Cc: Kirk McKusick <mckusick@mckusick.com>
Subject: UFS-2 partition destroyed by change
X-ASK-Info: Confirmed by User
I only had one UFS-2 partition, the backup root
partition on da1a. After McKusick's notice of change:
Message-ID: <200211250511.gAP5BU59067794@beastie.mckusick.com>
for 26 Nov, I installed the kernel and world sliced at
1200 GMT 27 Nov.
As a matter of principle, I _always_ run fsck -y from
single user at reboot of a new world (which means every
day now) even though I have not had a crash --pardon me
for too many years of BSD, but habits stick
da1a was shredded; only lost+found:
p1:da1a #535-> ll lost+found/
total 8
0 br-xrw--wT 1 root wheel 0, 0 Jan 1 1970 #00455
0 br-xrw--wT 1 root wheel 0, 0 Jan 1 1970 #00561
0 br-xr-xr-x 1 root wheel 0, 0 Jan 1 1970 #00813
0 br-xr-x--t 1 root wheel 0, 0 Jan 1 1970 #00865
8 d-wSr-x--T 2 root wheel 8192 Jan 1 1970 #01031
The directory is empty. No pipers for Last Post, but a
rather good sendoff of 80MB to bit heaven. No other
partition even whimpered.... and nothing really lost
since it was a duplicate of da0a.
I was about to convert the remaining 9 partitions to
UFS-2 when I read Kirk's notice and decided to wait. I'll
rebuild the da1a partition with UFS-2 (new and improved
version?) and see what happens tomorrow morning with the
1200 GMT 28 Nov slice.
If I do a 'disklabel -B da1' (I have a pair of
dangerously dedicated 9G 160 SCSIs), I presume that
/boot/mbr is now the correct "new" UFS-2 boot record? My
intention is to convert all parititions one-by-one,
except da0a, to UFS-2, and then 'boot -s' from da1 and
'dd' da0a since the disks are siamese twins.
--
Sanity is the Playground for the Unimaginative
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