Setting the data transfer speed on a Fibre Channel port

As system operation continues, you might notice that a large amount of data is transferred at some ports, but a small amount of data is transferred at other ports. You can optimize system performance on a Fibre Channel port by setting a faster data transfer speed on ports where a large amount of data is transferred, and setting a slower data transfer speed on ports where a smaller amount of data is transferred.

CautionWhen a port has a path defined for an LDEV with the GAD reserve attribute and you need to change the transfer speed, the operation might fail if you configure more than one port at a time. For ports that have a path defined for an LDEV with the GAD reserve attribute, perform this operation on one port at a time.

Before you begin

The Storage Administrator (Provisioning) role is required to perform this task.

Procedure

  1. Click Storage Systems, and then expand the Storage Systems tree.

  2. Click Ports/Host Groups/iSCSI Targets.

  3. In the Ports/Host Groups/iSCSI Targets window, click the Ports tab.

  4. Select the desired port, and then click Edit Ports.

  5. In the Edit Ports window, select the Port Speed check box, and then select the desired port speed.

    Select the speed of the Fibre Channel port in the unit of Gbps (Gigabit per second). If Auto is selected, the storage system automatically sets the speed to 2, 4, 8, or 16 Gbps.
    CautionObserve the following cautions when setting speed on a Fibre Channel port:
    • If the host bus adapters (HBAs) and switches support 2 Gbps, use the fixed speed of 2 Gbps for the channel board for Fibre Channel (CHB(FC)) port speed. If they support 4, 8, or 16 Gbps, use 4, 8, or 16 Gbps for the CHB(FC) port speed, respectively.
    • If the Auto Negotiation setting is required, some links might not be up when the server is restarted. Check the channel lamp. If it is flashing, disconnect the cable, and then reconnect it to recover from the link-down state.
    • If the CHB(FC) port speed is set to Auto, some equipment might not be able to transfer data at the maximum speed.
    • When you start a storage system, HBA, or switch, check the host speed appearing in the Port list. If the transfer speed is different from the maximum speed, select the maximum speed from the list on the right, or disconnect, and then reconnect the cable.

    • The available port speed which is specified in Port Speed is limited due to the combination of the type of the Fibre Channel port and the topology which is specified in Connection Type.

  6. Click Finish.

    The Confirm window appears.

  7. In the Task Name text box, type a unique name for the task or accept the default.

    You can enter up to 32 ASCII characters and symbols, with the exception of: \ / : , ; * ? " < > |. The value <date>-<window name> is entered by default.

  8. Click Apply.

    If the Go to tasks window for status check box is selected, the Tasks window appears.
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