Fibre Channel Link Failures; Servicing Storage Systems - IBM Storwize V7000 Maintenance Manual

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.
The following items can indicate that a single Fibre Channel link has failed:
v The customer's SAN monitoring tools
v The Fibre Channel status LEDs at the rear of the node canister
v An error that indicates that a single port has failed
Attempt each of the following 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 node.
4. Perform the Fibre Channel switch service procedures for a failing Fibre Channel
5. Contact IBM Support for assistance in replacing the node canister.

Servicing storage systems

Storage systems that are supported for attachment to the Storwize V7000 system
are designed with redundant components and access paths to enable concurrent
maintenance. Hosts have continuous access to their data during component failure
and replacement.
The following guidelines apply to all storage systems that are attached to the
Storwize V7000 system:
v Always follow the service instructions that are provided in the documentation
v Ensure that there are no unfixed errors in the event log before you perform any
v After you perform a service procedure, check the event log and fix any errors.
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
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.
link. This might involve replacing the SFP transceiver at the switch.
for your storage system.
service procedures.
Expect to see the following types of errors:
– MDisk error recovery procedures (ERPs)
– Reduced paths
Chapter 6. Resolving a problem
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