VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Chapter 4 138
Adding a Disk to a Disk Group
To add a disk to an existing disk group, use menu item 1 (Add or
initialize one or more disks) of the vxdiskadm command, as described in
“Adding a Disk to VxVM” on page 80.
You can also use the vxdiskadd command to add a disk to a disk group,
for example:
# vxdiskadd c1t2d0
where c1t2d0 is the device name of a disk that is not currently assigned
to a disk group.