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
