San Problem Determination; Fibre Channel Link Failures - IBM Storwize V7000 Unified Problem Determination Manual

SAN problem determination

About this task
SAN failures might cause Storwize V7000 Unified 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
2. Verify that the Fibre Channel cables that connect the systems to the switches
3. If you have a SAN management tool, use that tool to view the SAN topology

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 Unified
4.
5. Contact IBM Support for assistance in replacing the node canister.
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Storwize V7000 Unified: Problem Determination Guide Version
the Storwize V7000 Unified system uses, and that they are not reporting any
hardware failures. If problems are found, resolve those problems before
proceeding further.
are securely connected.
and isolate the failing component.
Storwize V7000 Unified node.
Note: Storwize V7000 Unified 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
replace is a longwave SFP transceiver, for example, you must provide a suitable
replacement. Removing the wrong SFP transceiver could result in loss of data
access.