Create a file system on the shared disk. The /etc/vfstab should be identical on all the nodes of the cluster.
For CFS, it should look similar to the following example.
## Cluster File System/Global File System ## /dev/md/penguin/dsk/d400 /dev/md/penguin/rdsk/d400 /cal ufs 2 yes global,logging
For example, for FFS:
## Fail Over File System/Local File System ## /dev/md/penguin/dsk/d400 /dev/md/penguin/rdsk/d400 /cal ufs 2 no logging
The fields in these commands are separated by tabs, not just spaces.