If, however,the current topology is LOOP, you have to change the topology to
FABRIC to operate in a fabric. You will never see the Nvram read failed
message if the current topology is LOOP. The NVRAM has to have been
formatted to change the current mode to LOOP.
Consider the case where the KGPSA current topology is LOOPas follows:
P00>>> wwidmgr -show adapter
item adapter WWN Cur. Topo Next Topo
[ 0] pga0.0.0.3.1 1000-0000-c920-eda0 LOOP LOOP
[ 1] pgb0.0.0.4.0 1000-0000-c920-da01 LOOP LOOP
[9999] All of the above.
If the current topology for an adapter is LOOP, set an individual adapter to
FABRIC by using the item number for that adapter (for example, 0 or 1).
Use 9999 to set all adapters:
P00>>> wwidmgr -set adapter -item 9999 -topology fabric
Reformatting nvram
Reformatting nvram
Displaying the adapter information again will show the topology that the
adapters will assume after the next console initialization:
P00>>> wwidmgr -show adapter
item adapter WWN Cur. Topo Next Topo
[ 0] pga0.0.0.4.1 1000-0000-c920-eda0 LOOP FABRIC
[ 1] pgb0.0.0.3.0 1000-0000-c920-da01 LOOP FABRIC
[9999] All of the above.
This display shows that the current topology for both KGPSA host bus
adapters is LOOP, but will be FABRIC after the next initialization.
A system initialization configures the KGPSAs to run on a fabric.
6.5.2.3 Obtainingthe WorldwideNames of KGPSA Adapters
A worldwide name 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. You should 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 both a node name and a port name worldwide
name, both of which are 64-bit numbers. Most commands you use with Fibre
Channel only show the port name.
There are multiple ways to obtain the KGPSAport name worldwide name:
•Youcan obtain the worldwide name from a label on the KGPSA module
before you install it.
•Youcan use the show dev command as follows:
Using Fibre Channel Storage 6–25