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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
If 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 and If One-to-One
Connections Link HBAs and Ports.
If one-to-one connections are established between HBAs and ports, you can
set the threshold value by the following two ways:
•
Set a threshold value for each prioritized port
•
Set 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 Server Priority Manager. The Server Priority Manager window is
displayed.
2. Select the Port tab.
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 lest 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.
Note: If you want to set one threshold value for the entire storage system,
this step is unnecessary.
4. Do one of the following:
– 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 3 above. Repeat this
operation to set the thresholds for all the prioritized ports. You can use
different types of rates (IOPS or MB/s) for thresholds of different
prioritized ports.
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Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
Server Priority Manager Operation
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