HP StorageWorks XP24000/XP20000 Performance Control User Guide (T5214-96087, September 2010)

NOTE:
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.
5. 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. Next, 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. Next, enter the upper-limit value in the cell.
In the list, either the IOPS or the MB/s column is activated depending on the rate selected at step
3. 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.
6. Click Apply.
The settings in the window are applied to the storage system. The upper-limit value that you
entered turns black.
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.
Setting a Threshold in the Port Tab
If a threshold control is used, upper-limit control is automatically disabled when traffic between
production servers and the storage system is reduced to a specified level. For details, see “Upper-Limit
Control” on page 12 and “If Many-to-Many Connections Link HBAs and Ports” on page 28.
If one-to-one connections are established between HBAs and ports, you can set the threshold value
in the following two ways:
• Click a threshold value for each prioritized port
• Click one threshold value for the entire storage system
The procedures for these operations are explained below.
To set threshold values to traffic at prioritized ports:
1. Start XP Performance Control (see “Starting XP Performance Control” on page 32).
The Performance Control window is displayed.
2. Click the Port tab (Figure 3 on page 18).
3. To set a threshold value for each prioritized port, select the type of rates for the threshold value
from the list at the upper left corner of the list.
• To use the I/O rates for the threshold value, click IOPS.
• To use the transfer rates for the threshold value, click MB/s.
NOTE:
To set one threshold value for the entire storage system, this step is unnecessary.
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