Setting upper-limit values for non-prioritized ports: one-to-one connections

After you analyze traffic statistics, you can set upper limit values for I/O rates or data transfer rates on non-prioritized ports to provide better performance for high-priority host servers. For details about upper limit values, see Upper-limit control.

When you set an upper limit for the first time, it is recommended that the upper limit value be approximately 90 percent of the peak traffic.

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.

Display the Device Manager - Storage Navigator main window.

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 Port tab.

Do one of the following:

To limit the I/O rate for the non-prioritized port, select IOPS from the list at the upper left corner of the list.

To limit the transfer rate for the non-prioritized port, select MB/s from the list at the upper left corner of the list.

Locate the non-prioritized port in the list.

The Attribute column of the list indicates whether ports are prioritized or non prioritized. If you cannot find any non prioritized port in the list, check the list at the top right corner of the window. If the list displays Prioritize, select All or Non Prioritize from the list.

Do one of the following:

To limit the I/O rate for the non-prioritized port, double-click the desired cell in the IOPS column in Upper, and enter the upper limit value in the cell.

To limit the transfer rate for the non-prioritized port, double-click the desired cell in the MB/s column in Upper, and enter the upper limit value in the cell.

In the list, either of IOPS or MB/s column is activated depending on the rate selected in step 3 above. You can use either of them to specify the upper limit value for one port. You can specify different types of rates (IOPS or MB/s) for the upper limit values of different non-prioritized ports.

The upper limit value that you entered is displayed in blue.

If an upper limit of the non-prioritized WWN is set to zero or nearly zero, I/O performance might be lowered. If I/O performance is lowered, the host cannot be connected to the storage system in some cases.

Click Apply to apply the settings to the storage system. The upper limit value that you entered turns black.