HP StorageWorks Fabric OS 5.3.x administrator guide (5697-0244, November 2009)

Fabric OS 5.3.0 administrator guide 323
Correcting link failures
A link failure occurs when a server or storage is connected to a switch, but the link between the
server/storage and the switch does not come up. This prevents the server/storage from communicating
through the switch.
If the switchShow command or LEDs indicate that the link has not come up properly, use one or more of
the following procedures.
To determine if the negotiation was successfully completed
The port negotiates the link speed with the opposite side. The negotiation usually completes in 1-2 seconds;
however, sometimes the speed negotiation fails.
NOTE: Skip this procedure if the port speed is set to a static speed through the portCfgSpeed
command.
To determine if the negotiation was successfully completed
1. Enter the portCfgShow command to display the port speed settings of all the ports.
2. Enter the switchShow command to determine if the port has module light.
3. Determine whether or not the port at 1Gig/sec completes by entering the portCfgSpeed command.
Then change the port speed to 2 Gig/sec. This should correct the negotiation by setting to one speed.
4. Enter the portLogShow or portLogDump command.
5. Check the events area of the output. The first example is 1 Gbit/sec and the second example is
2 Gbit/sec:
• sn indicates a speed negotiation.
• NC indicates negotiation complete.
• 01 or 02 indicate the speed that has been negotiated.
• If these fields do not appear, proceed to the step 6.
6. Correct the negotiation by entering the portCfgSpeed [slotnumber/]portnumber,
speed_level command if the fields in step 5 do not appear.
To check for a loop initialization failure
1. Verify the port is an L_Port.
a. Enter the switchShow command.
b. Check the comment field of the output to verify that the switch port indicates an L_Port. If a loop
device is connected to the switch, the switch port must be initialized as an L_Port.
c. Check to ensure that the port state is online; otherwise, check for link failures.
2. Verify the loop initialization if the port is not an L_port.
a. Enter the portLogShow or portLogDump command.
b. Check argument number four for the LISA frame (0x11050100) .
The LISA frame indicates that the loop initialization is complete.
14:38:51.976 SPEE sn <Port#> NC 00000001,00000000,00000001
14:39:39.227 SPEE sn <Port#> NC 00000002,00000000,00000001
switch:admin> portlogdumpport 4
time task event port cmd args
-------------------------------------------------
11:40:02.078 PORT Rx3 23 20 22000000,00000000,ffffffff,11050100
Received LISA frame