Veritas DBE/AC 3.5 for Oracle RAC used an older disk layout version. While mounting the shared volume with CFS 3.5, you will get a warning message that the disk layout versions are old. You must upgrade the disk layout to version 6 or 7.
The following example command shows the upgrade process from a version 4 disk layout (for Veritas DBE/AC 3.5) to a version 7 disk layout (for SF 5.0 for Oracle RAC):
# mount -F vxfs -o cluster /dev/vx/dsk/oradata_dg\