Server Priority Manager Operati on 6-17
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
Caution: If you enter zero (0) in a cell to disable the upper limit, the cell
displays a hyphen (-) and the threshold for the prioritized port becomes
ineffective. If the thresholds of all the prioritized ports are ineffective,
threshold control will not be performed but upper limit control will be
performed. If you set thresholds for multiple prioritized ports and the I/O
rate or transfer rate becomes below the threshold at one of the prioritized
port, threshold control works in the entire storage system and the upper
limits of the non-prioritized ports are disabled. The following table shows
the relationship between the thresholds and the upper limits.

Table 6-2 Relationship between the Thresholds of the Prioritized Port

and the Upper Limits of the Non-prioritized Port

Thresholds
Settings A Number Other Than Zero Is Set to The
Upper Limit of The Non-prioritized port Zero Is Set to The Upper Limit of The
Non-prioritized port
Threshold Is Set
to The Prioritized
port
When thresholds are set to multiple
prioritized ports, depending on the
transfer rate, following controls are
executed.
If I/O rate or transfer rate exceeds the
threshold in any prioritized port,
upper limits of all the non-prioritized
ports take effect.
If I/O rate or transfer rate goes below
the threshold in any prioritized port,
upper limits of all the non-prioritized
ports do not take effect.
The threshold control of the prioritized
port is not executed.
Threshold Is Not
Set to The
Prioritized port
The specified upper limit always takes
effect.
– To set one threshold to the entire storage system, select the All
Thresholds check box. Next, select IOPS or MB/s from the list of
right side in All Thresholds and enter the threshold value in the text
box. Even if the types of rates for upper limit values and the threshold
are different, the threshold control can work for all the non-prioritized
ports.
5. Click Apply. The settings in the window are applied to the storage system.
WWN Tab Operations
If many-to-many connections are established between host bus adapters
(HBAs) and storage system ports, you use the WWN tab in the Server
Priority Manager window to do the following:
• Make all the traffics between host bus adapters and ports monitored
• Analyze traffic statistics
• Measure traffic between host bus adapters and storage system ports