HP XP Continuous Access Software - Manual (Page 239)

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If this option is not specified, then a region for a target
volume is set as all blocks (SLBA=0; ELBA=0).
-vg [type][rtime] Specifies the following guard types to the target
volumes for HP StorageWorks LUN Security XP
Extension.
If [type] is not specified, then this option disables all
guarding. If no guard type has been specified, then the
volume will be unguarded (read and write operations
from the host as well as use as an S-VOL will be
allowed).
If [type] has been specified previously to set a guard
level and the time specified in [rtime] has not elapsed,
the guard characteristics of the target volumes will not
be changed.
If [type] has been specified previously to set a guard
level and the time specified in [rtime] has elapsed, then
not specifying [type] will disable all guarding for the
target volumes.
NOTE: Once a volume has guard attribute set, write
access for that volume cannot be restored by the
customer until [rtime] has expired. If a volume has been
set to a guarded state by accident, contact HP support
for recovery of the volume. Valid values for type:
inv
Conceals the target volumes from the SCSI Inquiry
command by responding with “unpopulated volume.”
Sz0
The target volumes reply with “SIZE 0” through the
SCSI read capacity command.
rwd
Disables the target volumes from reading and writing.