Technical data

For more information on the wwidmgr utility, see the wwidmgr
User’s Manual, which is on the Alpha Systems Firmware Update
CD-ROM in the DOC directory.
4.2.3 Obtain the Fibre Channel Adapter Worldwide Name
A worldwide name (WWN) is a unique number assigned to a subsystem
by the Institute of Electrical and Electronics Engineers (IEEE) and set by
the manufacturer prior to shipping. The worldwide name assigned to a
subsystem never changes. We recommend that you obtain and record the
worldwide names of Fibre Channel components in case you need to verify
their target ID mappings in the operating system.
Fibre Channel devices have a 128-bit worldwide ID or name (WWID,
WWN) made up of a 64-bit node name (node worldwide name, node WWN,
or WWNN) and a 64-bit port name (port worldwide name, port WWN, or
WWPN). The most significant four digits are 2000 for the node worldwide
name, and 1000 for the port worldwide name for most Fibre Channel
adapters currently supported.
There are multiple ways to obtain a Fibre Channel adapter node or port
WWN:
• You can obtain the WWN from a label on the Fibre Channel adapter
module before you install it.
_____________________ Note _____________________
The label on the Fibre Channel adapter module provides the
least significant 12 hex digits of both the node and port WWN.
Software adds the most significant 4 hex digits (either 2000
for the node WWN or 1000 for the port WWN).
• You can use the show dev command to obtain the port WWN (labeled
WWN) as follows:
P00>>> show dev
.
.
.
pga0.0.0.7.0 PGA0 WWN 1000-0000-c927-242e
pgb0.0.0.8.0 PGB0 WWN 1000-0000-c927-2e67
• You can use the wwidmgr -show adapter command as follows to
obtain the port WWN:
P00>>> wwidmgr -show adapter
item adapter WWN Cur. Topo Next Topo
[ 0] pga0.0.0.7.0 1000-0000-c927-242e FABRIC FABRIC
[ 1] pgb0.0.0.8.0 1000-0000-c927-2e67 FABRIC FABRIC
[9999] All of the above.
4-6 Preparing the MSA1000 for TruCluster Server Use