IBM Storwize V7000 Unified Problem Determination Manual page 264

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.
Ethernet iSCSI host-link problems
If you are having problems attaching to the Ethernet hosts, your problem might be
related to the network, the Storwize V7000 Unified system, or the host.
Before you begin
For network problems, you can attempt any of the following actions:
v Test your connectivity between the host and Storwize V7000 Unified ports.
v Try to ping the Storwize V7000 Unified system from the host.
v Ask the Ethernet network administrator to check the firewall and router settings.
v Check that the subnet mask and gateway are correct for the Storwize V7000
Using the management GUI for Storwize V7000 Unified problems, you can attempt
any of the following actions:
v View the configured node port IP addresses.
v View the list of volumes that are mapped to a host to ensure that the volume
v Verify that the volume is online.
For host problems, you can attempt any of the following actions:
v Verify that the host iSCSI qualified name (IQN) is correctly configured.
v Use operating system utilities (such as Windows device manager) to verify that
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Storwize V7000 Unified: Problem Determination Guide 2073-720
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.
Unified host configuration.
host mappings are correct.
the device driver is installed, loaded, and operating correctly.