Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

To migrate from HP-UX native multipathing to DMP
1
Stop all the volumes in each disk group on the system:
# vxvol -g diskgroup stopall
2
Use the following commands to initiate the migration:
# vxddladm rmforeign blockdir=/dev/disk chardir=/dev/rdisk
# vxconfigd -kr reset
For migration involving a current boot disk, use:
# vxddladm -r rmforeign blockdir=/dev/disk/ chardir=/dev/rdisk/
145Administering Dynamic Multipathing
How DMP works