[Ocfs2-users] Group Descriptor # 0 has bad signature

[Sunil Mushran]

Do:
# fsck.ocfs2 -f /dev/sda1

Rich Amick wrote:
> Testing OCFS2 on a 2 node cluster.  
> Both nodes are HP DL380G5 with RHEL4U3 x86_64 (2.6.9-34.ELsmp).  
> OCFS2 version 1.2.5-1.  
> Shared storage is MSA1000.
>
> Formatted a 142GB volume with:
> mkfs.ocfs2 -b 4K -C 32K -N 4 -L u01 /dev/sda1 
>
> Mounted the formatted partition on both nodes:
> mount -t ocfs2 /dev/sda1 /u01
>
> Create a file on oracle1:
> [root at oracle1 bin]# echo test > /u01/test2
>
> The file is visable on both the nodes:
> [root at oracle0 bin]# ls -l /u01/test2
> -rw-r--r--  1 root root 5 Jun  6 13:22 /u01/test2
> [root at oracle1 bin]# ls -l /u01/test2
> -rw-r--r--  1 root root 5 Jun  6 13:22 /u01/test2
>
> Created a file on oracle0:
> [root at oracle0 bin]# echo test > /u01/test3
> echo: write error: Input/output error
>
> OCFS2 marks the file system as read-only on oracle0.
> /var/log/messages from oracle0:
> Jun  6 11:07:05 oracle0 kernel: OCFS2: ERROR (device sda1):
> ocfs2_check_group_descriptor: Group Descriptor # 0 has bad signature
> Jun  6 11:07:05 oracle0 kernel: File system is now read-only due to the
> potential of on-disk corruption. Please run fsck.ocfs2 once the file system
> is unmounted.
>
> Unmount the partition on both nodes and run fsck:
> [root at oracle0 bin]# /sbin/fsck.ocfs2 /dev/sda1 
>
> Checking OCFS2 filesystem in /dev/sda1:
>   label:              /u01
>   uuid:               64 ef 7f 3a b7 03 4f 8e 8b e2 82 aa 5b c2 cc ea 
>   number of blocks:   35563880
>   bytes per block:    4096
>   number of clusters: 4445485
>   bytes per cluster:  32768
>   max slots:          4
>
> /dev/sda1 is clean.  It will be checked after 20 additional mounts.
>
> Remounting the volume reproduces same scenerio.
>
>
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