From owner-freebsd-current  Wed Sep  4  0:17:18 2002
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Date: Wed, 4 Sep 2002 17:24:30 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: "D. Rock" <D.Rock@t-online.de>
Cc: current@FreeBSD.ORG
Subject: Re: fsck cannot find superblock
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On Tue, 3 Sep 2002, D. Rock wrote:

> with 'uncommon' block sizes fsck seems to have problems finding the
> superblock:
>
> # newfs -i 10240 -b 4096 -f 512 /dev/ad1d
> Reduced frags per cylinder group from 26208 to 26200 to enlarge last cyl group
> /dev/ad1d: 409.6MB (838860 sectors) block size 4096, fragment size 512
>          using 33 cylinder groups of 12.79MB, 3275 blks, 1312 inodes.
> super-block backups (for fsck -b #) at:
>   32, 26232, 52432, 78632, 104832, 131032, 157232, 183432, 209632, 235832,
>   262032, 288232, 314432, 340632, 366832, 393032, 419232, 445432, 471632,
>   497832, 524032, 550232, 576432, 602632, 628832, 655032, 681232, 707432,
>   733632, 759832, 786032, 812232, 838432
> # fsck /dev/ad1d
> ** /dev/ad1d
> Cannot find file system superblock
>
> LOOK FOR ALTERNATE SUPERBLOCKS? [yn] n

fsck_ffs has no problems here with (whole) md disk of the same size.
Perhaps I have fixed the problem without noticing.  dumpfs or comparison
with a non-broken filesystem of the same size might show the problem.

Bruce


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