From: Mahmoud Negm (Mahmoud.Negm@vodafone.com)
Date: Sun Mar 20 2005 - 06:01:45 EST
Dear,
If the superblock is corrupted the file system still can be repaired using
alternate superblock which are formed while making new file system .
the first alternate superblock number is 32 and others superblock numbers can
be found using the following command :
newfs -N <RAW_Device>
for example to run fsck using first alternate superblock following command is
used
fsck -F File_System -o b=32 <Raw_Device>
Best Regards,
Negm
-----Original Message-----
From: sunmanagers-bounces@sunmanagers.org
[mailto:sunmanagers-bounces@sunmanagers.org]On Behalf Of richard kumar
Sent: Friday, March 18, 2005 2:29 PM
To: sunmanagers@sunmanagers.org
Subject: Superblock error --scsi disk
Hi All,
I guess my superblock is corrupted . can anyone know how to corect
this
# fsck -y
** /dev/rdsk/c0t1d0s0
** Currently Mounted on /
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
FILE SYSTEM STATE IN SUPERBLOCK IS WRONG; FIX? yes
50317 files, 1131203 used, 357584 free (7192 frags, 43799 blocks, 0.4%
fragmentation)
FILE SYSTEM IS CURRENTLY MOUNTED. CONTINUE? yes
** /dev/rdsk/c0t1d0s7
** Currently Mounted on /export/home
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
81601 files, 12368018 used, 20612242 free (15354 frags, 2574611 blocks,
0.0% fragmentation)
** /dev/rdsk/c0t1d0s2
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).
#
Regards
A.Richard
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