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

Preparing the Host System
123HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide
Note: The Selective Management Presentation feature only applies to commands
received by way of a SCSI SEND_DIAG command. If the HSG80 receives a
SEND_DIAG command over a disabled management connection, an
ILLEGAL_REQUEST CHECK_COND will be returned with an ASC=0x91 and
ASCQ=0x08. Any command delivered to the HSG80 Serial Port bypasses this
constraint and will be processed.
Linking WWIDs for Snap and Clone Units
LUN WWIDs (World Wide Identifiers) for snap and clone units are different each
time they are created. This causes more system data records to keep track of the
WWIDs as well as script changes at the customer sites. To eliminate this issue, a
linked WWID scheme has been created, which keeps the WWIDs of these units
constant each time they are created.
The WWID of a LUN is 128bits long, and is composed as follows:
Controller Node ID is the 64-bit Fibre Channel node id of the controller pair.
Controller Serial is the low-order 48 bits of the controller that “initialized” the
storage set. The Controller_Serial is composed from several fields, but the high
order 12 bits are a Reserved Field.
VSN_Seed is a counter that is incremented every time we initialize a storage set.
If the linked WWID is already in use, a unique WWID is allocated, and a message
to this effect is displayed. This is not a syntax error and does not cause the
command to fail.
CLI format
CLI> add snapshot_units <SnapUnit> <UnitName> <SourceName>
use_parent_wwid
Snapshot Unit - unit number to be assigned to the snap unit.
Unit Name - name of storage set or disk that will become the
snap unit.
Source Name - unit number of source storage set or disk.
Example:
CLI> add snap d2 disk10100 d1 use_parent_wwid
LW3 LW2 LW1 LW0
Controller Node ID Controller Serial VSN_Seed