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The Link is down message indicates that one of the adapters is not
available, probably due to its not being plugged into a switch. The warning
message Nvram read failed indicates that the KGPSA NVRAM has not
been initialized and formatted. The next topology will always be UNAVAIL
for the host bus adapter that has an unformatted NVRAM. Both messages
are benign and can be ignored for the fabric mode of operation. To correct
the Nvram read failed situation, use the wwidmgr -set adapter
command.
The previous display shows that all three KGPSA host bus adapters are set
for fabric topology as the current topology, the default. When operating in
a fabric, if the current topology is FABRIC, it does not matter if the next
topology is Unavail, or that the NVRAM is not formatted (Nvram read
failed).
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 LOOP as 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 -topo fabric
Reformatting nvram
Reformatting nvram
______________________ Note _______________________
The qualifier in the previous command is -topo and not
-topology. You will get an error if you use -topology.
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.
6–26 Using Fibre Channel Storage