Procedure
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 node.
Note: Storwize V7000 Unified nodes are supported by 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 might result in loss of data
access.
4. Contact the IBM Support Center 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.
Note: SVC/V7K and Host IP should be on the same VLAN. Host and SVC nodes
should not have same subnet on different VLANs.
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
Unified host configuration.
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
host mappings are correct.
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
the device driver is installed, loaded, and operating correctly.
v If you configured the VLAN, check that its settings are correct. Ensure that Host
Ethernet port, Storwize V7000 Unified Ethernet ports IP address, and Switch
port are on the same VLAN ID. Ensure that on each VLAN, a different subnet is
used. Configuring the same subnet on different VLAN IDs can cause network
connectivity problems.
Chapter 5. Control enclosure 379
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