You can check the logical volume name of a mounted device by
    issuing a command in the following format:

     $ WRITE SYS$OUTPUT F$GETDVI("device","LOGVOLNAM")

    When you use the SET VOLUME command to change the volume label
    of a nonsystem device that contains installed products, you
    must also use the PRODUCT REGISTER VOLUME command to update the
    product database with this information. Register the new volume
    label after you dismount and remount the volume so that the new
    logical volume name (DISK$labelname) is defined.

    If you change the volume label of the system device, you do not
    need to use the PRODUCT REGISTER VOLUME command because PCSI
    automatically detects the change after the volume is remounted
    following a system reboot.