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6-16 Server Priority Manager Operation
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
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 stora
g
e 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.