Setting an upper-limit value to HBAs in an SPM group

If all host bus adapters in an SPM group are non-prioritized WWNs, you can set an upper limit value to HBA performance (i.e., I/O rate or transfer rate). You can assign one upper limit value for one SPM group.

For example, suppose that the upper limit value 100 IOPS is assigned to an SPM group consisting of four host bus adapters. If the sum of the I/O rate of the four host bus adapters reaches 100 IOPS, Server Priority Manager controls the system so that the sum of the I/O rates will not exceed 100 IOPS.

Prerequisites

Required role: Storage Administrator (System Resource Management)

The Device Manager - Storage Navigator secondary window must be enabled.

Procedure

Display the Performance Monitor window.

In Device Manager - Storage Navigator:

Select Analytics in Explorer.

Select Performance Monitor in the tree to open the Performance Monitor window.

In Hitachi Command Suite:

Select the Resources tab, and expand the Storage Systems tree.

Right-click the target storage system and then select Performance Monitor.

In the Performance Monitor window, click Server Priority Manager to open the Server Priority Manager window.

Click to change to Modify mode.

In the Server Priority Manager window, click Server Priority Manager. The Server Priority Manager main window appears.

Select the WWN tab.

In the lower-left tree, select and right-click the Storage System folder or an SPM group ().

If you selected the Storage System folder, take the following steps:

Select IOPS or MB/s from the list at the upper-left corner of the list. Select IOPS if you want to assign an upper limit to the I/O rate. Select MB/s if you want to assign an upper limit to the transfer rate.

To assign an upper limit to the I/O rate, enter the upper limit value in the IOPS column of the list. To assign an upper limit to the transfer rate, enter the upper limit value in the MB/s column of the list.

If you cannot see the IOPS or MB/s column, scroll the list to the left. The column is located at the right side of the list.

If you selected an SPM group (), take the following steps:

Right-click the selected SPM group and then select Change Upper Limit from the pop-up menu. The Change Upper Limit dialog box opens.

To assign an upper limit to the I/O rate, enter the upper limit value and then select IOPS from the list. Next, select OK. To assign an upper limit to the transfer rate, enter the upper limit value and then select MB/s from the list. Next, select OK.

In the Server Priority Manager main window, click Apply to apply the settings to the storage system.

To confirm an upper limit value specified for each SPM group, select the Storage System folder in the lower-left tree on the WWN tab. The SPM groups are displayed in the list and you can confirm each upper limit value.