Observe the following cautions when setting speed on a fibre channel port:Setting the data transfer speed on a fibre channel port
The Storage Administrator (Provisioning) role is required to perform this task.
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 larger amount of data is transferred, and setting a slower data transfer speed on ports where a smaller amount of data is transferred.
To set the data transfer speed on a fibre channel port:
Perform one of following to display the Ports / Host Groups / iSCSI Targets tab.
For Hitachi Command Suite:
On the Resource tab, expand the Storage Systems tree. On the target storage system, click Port / Host Group.
For Storage Navigator:
In the storage system tree, select Ports / Host Groups / iSCSI Targets.
Select the Ports tab.
Select the desired port.
Click Edit Ports.
In the Edit Ports window, select the Port Speed check box, then select the desired port speed.
Select the speed of the fibre channel port. If Auto is selected, the storage system automatically sets the speed to 2, 4, 8, or 16 Gbps.
Observe the following cautions when setting speed on a fibre channel port:
If the HBAs (host bus adapters) and switches support 2 Gbps, use the fixed speed of 2 Gbps for the CHB(FC) (channel board for fibre channel) 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, 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, 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. For feasible combinations, see Combination of data-transfer speed and connection type.
Click Finish.
In the Confirm window, confirm the settings, in Task Name type a unique name for this task or accept the default, then click Apply.
If Go to tasks window for status is checked, the Tasks window opens.