HP StorageWorks HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide (AA-RV1VA-TE, March 2005)

Preparing the Host System
124 HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide
Example of error message text:
CLI> add snap d2 disk10100 d1 use_parent_wwid
A new WWID has been allocated for this unit because the linked
WWID for d2 is already in use.
CLI> run clonew
Implementation Notes
Add Snap with Linked WWID - The user has a script that runs every night to create
a snapshot, run a backup to tape from the snapshot, then delete the snapshot. Each
time this is done, a new WWID is allocated. When the operating system runs out
of room for all of these “orphaned” WWIDs, the host system must be rebooted.
Therefore the user decides to update the script such that the “add snap” command
reads as follows:
CLI> add snap d2 disk10100 d1 use_parent_wwid.
This results in same WWID being used for the snapshot each night.
Run Clonew - Operates the same as “CLI> run clone” with the exception that
clonew will use the linked WWID associated with the source unit instead of
allocating a new one.
CLI> run clonew
Run Clone - Works the same as v86. In other words a unique WWID is always
allocated to the clone unit.
Clonew of a Snap - The user wants to clone a snap unit without using any more
WWIDs. The clone created from the snap unit will be created using the linked
WWID associated with the snap unit.
Exception: A new WWID will be allocated if the snapshot was created using the
use_parent_wwid switch. Each WWID only has one linked WWID variation. If
the linked WWID is already in use, then a new unique WWID is allocated.
Snap of a Clone - The user want to snapshot a clone without using any more
WWIDs, and issues “CLI> add snap d3 disk10300 d2 use_parent_wwid”. D3, the
snapshot unit, will be created with the linked WWID associated with d2.
Exception: A new WWID will be allocated if the clone was created using the “run
clonew” command. Each WWID only has one linked WWID variation. If the
linked WWID is already in use, then a new unique WWID is allocated.