RE: Cant read superblocks

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

On 04/20/2016 05:33 AM, Weiner, Michael wrote:
> I received the following error:
>
> mount: wrong fs type, bad option, bad superblock on /dev/sdb1,

# dd if=/dev/sdb1 bs=1k count=1 skip=1 | od -h ...
0000060 a851 570e 0044 ffff ef53 0001 0001 0000 ...

"ef53" is a signature for ext3 filesystems.  Do you see it there? Do you see anything in that 1k of data?

[root@raos_apps01 ~]# dd if=/dev/sdb1 bs=1k count=1 skip=1 | od -h
0000000 2032 0000 6032 0000 a032 0000 e032 0000

What does parted tell you about sdb?

# parted /dev/sdb print

[root@raos_apps01 ~]# parted /dev/sdb print

Model: DELL PERC H700 (scsi)
Disk /dev/sdb: 15.0TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      1000kB  15.0TB  15.0TB               ext3

> I tried to get a listing of backup superblocks by doing the following:
>
> [root@raos_apps01 ~]# mke2fs -b 8192 -n /dev/sdb1
> mke2fs: 8192-byte blocks too big for system (max 4096) Proceed anyway? 
> (y,n) y

If you know that the maximum block size is 4096, why are you asking it for superblock on a filesystem with 8k blocks?
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