Date: Wed, 3 Dec 2003 19:32:20 -0800 (PST) From: "Scott I. Remick" <scott@sremick.net> To: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: "Cannot find file system superblock" error - how to recover? Message-ID: <20031204033220.49103.qmail@web41106.mail.yahoo.com> In-Reply-To: <20031203153902.1d42b9d9.itetcu@apropo.ro>
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--- Ion-Mihai Tetcu <itetcu@apropo.ro> wrote:
> FSCK_FFS(8)
>
> NAME
> fsck_ffs, fsck_ufs -- file system consistency check and interactive
> repair
>
> SYNOPSIS
> fsck_ffs [-BFpfny] [-b block#] [-c level] [-m mode] filesystem ...
>
>
> -b Use the block specified immediately after the flag as the super
> block for the file system. Block 32 is usually an alternate
> super block.
Ah, somehow never knew about fsck_ffs. Now I do :-)
Does it matter that /dev/ad6s1c is UFS2 and not UFS1?
> Try doing a newfs -N and see if using some of the alternatives
> super-blocks in fsck_ufs will help. Note that the alternate superblock
> is no longer always at 32, it depends on the size of the file system.
Whoa, something doesn't seem right. I do:
su-2.05b# newfs -N /dev/ad6s1c
/dev/ad6s1c: 76340.1MB (156344516 sectors) block size 16384, fragment size
2048
using 416 cylinder groups of 183.77MB, 11761 blks, 23552 inodes.
super-block backups (for fsck -b #) at:
160, 376512, 752864, 1129216, 1505568, 1881920, 2258272, 2634624, 3010976,
3387328, 3763680, 4140032, 4516384, 4892736, 5269088, 5645440, 6021792,
6398144, 6774496, 7150848, 7527200, 7903552, 8279904, 8656256, 9032608,
9408960, 9785312, 10161664, 10538016, 10914368, 11290720, 11667072,
12043424,
12419776, 12796128, 13172480, 13548832, 13925184, 14301536, 14677888,
15054240, 15430592, 15806944, 16183296, 16559648, 16936000, 17312352,
17688704, 18065056, 18441408, 18817760, 19194112, 19570464, 19946816,
20323168, 20699520, 21075872, 21452224, 21828576, 22204928, 22581280,
22957632, 23333984, 23710336, 24086688, 24463040, 24839392, 25215744,
25592096, 25968448, 26344800, 26721152, 27097504, 27473856, 27850208,
And this actually continues for quite a bit. There aren't really that many
copies of the superblock on the drive, right?
> * Depending on the architecture and the media, the superblock may
> * reside in any one of four places.
Yeah, a lot more than four...
Haven't tried anything yet. Awaiting expert advice first...
Thanks!
=====
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