Technical data

Fabric OS Administrator’s Guide 10-19

Publication Number: 53-0000518-09

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.

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.

turboramtest Verifies that the on chip SRAM located in the 2 Gbit/sec ASIC is using the

Turbo-Ram BIST circuitry. These same SRAMs are tested by portregtest and

sramretentiontest using PCI operations, but for this test the BIST controller is

able to perform the SRAM write and read operations at a much faster rate.

statstest Verifies that the ASIC statistics counter logic.

Related Switch Test Option:

itemlist Restricts the items to be tested to a smaller set of parameter values that you pass

to the switch.

Table 10-5 Switch Component Tests (Continued)

Test Function

ote

Skip this procedure if the port speed is set to a static speed through the portCfgSpeed command.

14:38:51.976 SPEE sn <Port#> NC 00000001,00000000,00000001

14:39:39.227 SPEE sn <Port#> NC 00000002,00000000,00000001