RE: Cant read superblocks

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From: Weiner, Michael [mailto:weinerm@xxxxxxx] 

From: Gordon Messmer [mailto:gordon.messmer@xxxxxxxxx] 

On 04/21/2016 10:08 AM, Weiner, Michael wrote:
>> mkfs.ext3 -F -b 4096 -n /dev/sdb1
>> >Note that I don't have a CentOS 5 system around for testing, and I don't know what mixing -F and -n does.
> Yeah I was a little nervous about that, and as such, I didn’t try it:)   because the flags are also counter to one another.

Nonetheless, if you created a 15TB ext3 filesystem using the vendor's tools, you would have *had* to use "-F -b 4096".  You're not going to locate superblock backups using any other set of arguments.

[root@raos_apps01 ~]# mke2fs -F -b 4096 -n /dev/sdb1 mke2fs 1.39 (29-May-2006) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2)
1830420480 inodes, 3660840711 blocks
183042035 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296
111720 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848, 512000000, 550731776, 644972544, 1934917632,
        2560000000

However I cannot use any of the superblocks it seems:

[root@raos_apps01 ~]# fsck -b 98304 /dev/sdb1
fsck 1.39 (29-May-2006)
e2fsck 1.39 (29-May-2006)
fsck.ext3: Bad magic number in super-block while trying to open /dev/sdb1

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

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