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.
Before you begin
- Required role: Storage Administrator (System Resource Management)
- You must enable the Device Manager - Storage Navigator secondary window. For details, see the Hitachi Device Manager - Storage Navigator User Guide of your storage system.
Procedure
Click 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.
Select whether to limit the I/O rate or the transfer rate for the non-prioritized port:
- To limit the I/O rate, select IOPS from the list at the upper left corner of the list.
- To limit the transfer rate, select MB/s from the list at the upper left corner of the list.
Locate the non-prioritized port in the list.
NoteThe 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.Enter the desired upper limit value for the non-prioritized port:
- To set the upper limit for the I/O rate, double-click the desired cell in the IOPS column in Upper, and enter the upper limit value in the cell.
- To set the upper limit for the transfer rate, 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 the IOPS or MB/s column is activated depending on the selected rate. 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.
CautionIf 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.