Setting a threshold: one-to-one connections
When one-to-one connections are established between HBAs and ports, you can set a threshold value for each prioritized port or one threshold value for the entire storage system. When traffic between high-priority servers and the ports or storage system falls below the specified threshold level, upper limit control is disabled to allow higher performance on non-prioritized ports during periods of low activity on prioritized ports. For details about threshold values, see Threshold control.
Before you begin
- Required role: Storage Administrator (System Resource Management)
- You must enable the Device Manager - Storage Navigator secondary window. For details, see the System Administrator 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.
If you want to set a threshold value for each prioritized port, select the type of rates for the threshold value from the list in the upper left corner of the list.
- To use the I/O rates for the threshold value, select IOPS.
- To use the transfer rates for the threshold value, select MB/s.
Set the desired threshold value:
- To set a threshold to each prioritized port, locate the desired prioritized port, which is indicated by
Prio. in the
Attribute column. Next, double-click the cell in the
IOPS or
MB/s column in
Threshold, and then enter the threshold value. In the list, either of
IOPS or
MB/s column is activated depending on the rate selected at step 5 above. Repeat this operation to set the thresholds for all prioritized ports. You can use different types of rates (IOPS or
MB/s) for thresholds of different prioritized ports.
CautionIf you enter zero (0) in a cell to disable the upper limit, the cell displays a hyphen (
-) and the threshold for the prioritized port becomes ineffective. If the thresholds of all prioritized ports are ineffective, threshold control will not be performed but upper limit control will be performed. If you set thresholds for multiple prioritized ports and the I/O rate or transfer rate goes below the threshold at all prioritized ports, threshold control works in the entire storage system and the upper limits of the non-prioritized ports are disabled. - To set one threshold to the entire storage system, select the All Thresholds check box. Next, select IOPS or MB/s from the list of right side in All Thresholds and enter the threshold value in the text box. Even if the types of rates for upper limit values and the threshold are different, the threshold control can work for all non-prioritized ports.
- To set a threshold to each prioritized port, locate the desired prioritized port, which is indicated by
Prio. in the
Attribute column. Next, double-click the cell in the
IOPS or
MB/s column in
Threshold, and then enter the threshold value. In the list, either of
IOPS or
MB/s column is activated depending on the rate selected at step 5 above. Repeat this operation to set the thresholds for all prioritized ports. You can use different types of rates (IOPS or
MB/s) for thresholds of different prioritized ports.
Click Apply to apply the settings to the storage system.