a. Verify that the host adapter is in good state. You can unload and load the
device driver and see the operating system utilities to verify that the device
driver is installed, loaded, and operating correctly.
SAN problem determination
About this task
SAN failures might cause Storwize V7000 volumes to be inaccessible to host
systems. Failures can be caused by SAN configuration changes or by hardware
failures in SAN components.
The following list identifies some of the hardware that might cause failures:
v Power, fan, or cooling switch
v Application-specific integrated circuits
v Installed small form-factor pluggable (SFP) transceiver
v Fiber-optic cables
Perform the following steps if you were sent here from the error codes:
Procedure
1. Verify that the power is turned on to all switches and storage controllers that
the Storwize V7000 system uses, and that they are not reporting any hardware
failures. If problems are found, resolve those problems before proceeding
further.
2. Verify that the Fibre Channel cables that connect the systems to the switches
are securely connected.
3. If you have a SAN management tool, use that tool to view the SAN topology
and isolate the failing component.
Fibre Channel link failures
When a failure occurs on a single Fibre Channel link, the small form-factor
pluggable (SFP) transceiver might need to be replaced.
Before you begin
The following items can indicate that a single Fibre Channel link has failed:
v The Fibre Channel status LEDs at the rear of the node canister
v An error that indicates a single port has failed
Attempt each of these actions, in the following order, until the failure is fixed:
1. Ensure that the Fibre Channel cable is securely connected at each end.
2. Replace the Fibre Channel cable.
3. Replace the SFP transceiver for the failing port on the Storwize V7000 Storwize
V7000 node.
Note: Storwize V7000 nodes are supported with both longwave SFP
transceivers and shortwave SFP transceivers. You must replace an SFP
transceiver with the same type of SFP transceiver. If the SFP transceiver to
68 Storwize V7000: Troubleshooting, Recovery, and Maintenance Guide
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