HP A7533A HP StorageWorks Fabric OS 6.x administrator guide (5697-0015, May 20 - Page 317
Correcting link failures
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See Table 71 for a list of additional tests that can be used to determine the switch components that are not functioning properly. See the Fabric OS Command Reference for additional command information. Table 71 Switch component tests Test Function portloopbacktest Performs a functional test of port N to N path. portregtest Performs a read and write test of the ASIC SRAMs and registers. spinsilk Performs a functional test of internal and external transmit and receive paths at full speed. sramretentiontest Verifies that the data written into the miscellaneous SRAMs in the ASIC are retained after a 10-second wait. portloopbacktest Verifies the functional components of the switch. turboramtest Verifies that the on chip SRAM located in the 2 Gbps 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 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. Correcting link failures A link failure occurs when a server or storage device 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. The port negotiates the link speed with the opposite side. The negotiation usually completes in one or two 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 1 Gbps completes by entering the portCfgSpeed command. Then change the port speed to 2 Gbps. 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: 14:38:51.976 SPEE sn NC 00000001,00000000,00000001 14:39:39.227 SPEE sn • sn indicates a speed negotiation. • NC indicates negotiation complete. If these fields do not appear, proceed to the step 6. NC 00000002,00000000,00000001 Fabric OS 6.x administrator guide 317