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After priority has been set, you can implement the procedure for measuring
traffic (I/O rates and transfer rates) (see Starting and Stopping Storage
System Monitoring)
Setting Upper-Limit Values to Traffic at Non-prioritized Ports
After you analyze traffic statistics, you must set upper limit values to I/O rates
or transfer rates for non-prioritized ports. Upper limit values for I/O rates are
used to suppress the number of I/Os from the low priority host servers and
thus provide better performance for high-priority host servers. Upper limit
values for transfer rates are used to suppress the amount of data that should
be transferred between the storage system and the low priority ports, and
thus provide better performance for high-priority host servers.
To limit the I/O rate or transfer rate of a non-prioritized port:
1. Start Server Priority Manager. The Server Priority Manager window is
displayed.
2. Select the Port tab.
3. 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.
4. Locate the non-prioritized port in the list.
Notes:
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 of IOPS or MB/s column is activated depending on the
rate selected at 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.
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
Server Priority Manager Operation
6-15
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