mount.ocfs2: Bad magic number in superblock while

 
[root@rac1 ~]# mount -t ocfs2 -o datavolume,nointr /dev/hdd1 /ocfs/
[root@rac1 ~]# df -h
文件系统              容量  已用 可用 已用% 挂载点
/dev/mapper/VolGroup00-LogVol00
                       18G  2.3G   15G  14% /
/dev/hda1              99M   12M   83M  13% /boot
tmpfs                 506M     0  506M   0% /dev/shm
/dev/hdd1              20G  519M   20G   3% /ocfs

[root@rac2 ~]# /etc/init.d/o2cb enable
Writing O2CB configuration: OK
Cluster ocfs2 already online

[root@rac2 /]# mount -t ocfs2 -o datavolume,nointr /dev/hdd1 /ocfs/
mount.ocfs2: Bad magic number in superblock while opening device /dev/hdd1