To convert a single volume file system to a multi-volume file system

1. Determine the version of the volume's disk group:

     # vxdg list dg1 | grep version: | awk '{ print $2 }'
     90

2. If the version is less than 110, upgrade the disk group:

     # vxdg upgrade dg1

3. Determine the disk layout version of the file system:

     # vxupgrade /mnt1
     /mnt1: vxfs file system version 7 layout

4. If the disk layout version is less than 7, upgrade to a disk layout version that is greater than or equal to 7, as per the requirement.

   Currently we can upgrade upto the disk layout version 10.

   #vxupgrade -n 8 /mnt1
   # vxupgrade -n 9 /mnt1
   # vxupgrade -n 10 /mnt1

5. Unmount the file system:

     # umount /mnt1

6. Convert the volume into a volume set:

     # vxvset -g dg1 make vset1 vol1

7. Edit the /etc/fstab file to replace the volume device name, vol1, with the volume set name, vset1.
8. Mount the file system:

     # mount -t vxfs /dev/vx/dsk/dg1/vset1 /mnt1

9. As necessary, create and add volumes to the volume set:

     # vxassist -g dg1 make vol2 256M
     # vxvset -g dg1 addvol vset1 vol2

10. Set the placement class tags on all volumes that do not have a tag:

      # vxassist -g dg1 settag vol1 vxfs.placement_class.tier1
      # vxassist -g dg1 settag vol2 vxfs.placement_class.tier2