You can choose to specify a mirror or submirror or allow the lucreate command to choose a free volume for you.
To specify a volume, append a comma and the name of the submirror or mirror to the device name. In the following option, the submirror d1 is specified.
-m /:/dev/dsk/c0t0d0s0,d1:attach |
To enable the software to choose a free volume, do not name the submirror or mirror. In this option, the submirror is not specified, and the software chooses a free volume.
-m /:/dev/dsk/c0t0d0s0:attach |