To make it easier to create snapshots of several volumes at the same time, both the vxsnap make and vxassist snapshot commands accept more than one volume name as their argument.
For traditional snapshots, you can create snapshots of all the volumes in a single disk group by specifying the option -o allvols to the vxassist snapshot command.
By default, each replica volume is named SNAPnumber-volume, where number is a unique serial number, and volume is the name of the volume for which a snapshot is being taken. This default can be overridden by using the option -o name=pattern.
See the vxassist(1M) manual page.
See the vxsnap(1M) manual page.