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 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.
