Bad super block: Magic number wrong

Applications Filesystems, Disks and Memory
1

Whenever i run,
# fsck -F ufs /dev/dsk/c0t0d0s7

The following error prompt out:-

** /dev/dsk/c0t0d0s7
BAD SUPER BLOCK: MAGIC NUMBER WRONG
USE AN ALTERNATE SUPER-BLOCK TO SUPPLY NEEDED INFORMATION;
eg. fsck [-F ufs] -o b=# [special ...]
where # is the alternate super block. SEE fsck_ufs(1M).

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Question:

  1. Is the error means that there is a bad sector somewhere?
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# fsck -F ufs -o b=32 /dev/dsk/c0t0d0s7
Alternate super block location: 32.
** /dev/dsk/c0t0d0s7
BAD SUPER BLOCK: MAGIC NUMBER WRONG
USE AN ALTERNATE SUPER-BLOCK TO SUPPLY NEEDED INFORMATION;
eg. fsck [-F ufs] -o b=# [special ...]
where # is the alternate super block. SEE fsck_ufs(1M).

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Question:

  1. I tried a few different numbers i get from running,
    # newfs -Nv /dev/dsk/c0t0d0s7
    in b=??, still the error appears, what should i do?
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Anything i have done incorrectly, please do point out.

Thanks in advance for reading or replying.

2

This does not necessarily indicate a bad sector in the sense that you have broken hardware. It probably just means that your filesystem is trashed.

The rest of your post is highly specific to the OS involved. It looks like Solaris. I have seen that happen on Solaris due to a broken version of fsck. Are you certain that your patches are up to date? I solved my problem by booting an installation disk for a more recent OS version into single user mode and running fsck directly from that.

If nothing else works, rebuild the filesystem and reload it from backups.

3

Yup, Solaris 9.

Thanks.
I solved the error by doing a newfs on it.

I'm having whole lots of problems setting up the server. :rolleyes:

Can i ask how do i check the configuration (what type of RAID is setup) on external hard disk (StorEdge A1000) through Enterprise 450 Server?

4

you need "raidmanager" software installed on the system.

NOTE: new question, new thread!