HP StorageWorks XP24000/XP20000 Performance Control User's Guide (T5214-96047, December 2008)

The list displays traffic statistics (that is, the average and peak I/O rates or transfer rates) of the
ports.
5. Analyze the information in the list and then determine upper-limit values that should be applied
to non-prioritized ports. If necessary, determine threshold values that should be applied to prior-
itized ports. For details on the upper-limit values and threshold values, see
“If One-to-One Connections Link HBAs and Ports” on page 27.
Setting Priority for Ports on the Storage System
If a one-to-one connection is established between HBAs and ports, you need to measure traffic between
high-priority HBAs and prioritized ports. You also need to measure traffic between low-priority HBAs
and non-prioritized ports.
Prioritized ports are ports on which the processing has high priority and non-prioritized ports are
ports on which the processing has low-priority. Specify a port that connects to a high-priority HBA as
a prioritized port. Specify a port that connects to a low-priority HBA as a non-prioritized port.
To assign priority to ports on the storage system:
1. Start XP Performance Control (see “Starting Performance Control” on page 34).
The Performance Control window is displayed.
2. Ensure that the Port tab is displayed (Figure 3 on page 18).
3. Select All from the list at the top right corner of the window.
4. Right-click a high-priority port and then select Non-Prio -> Prio from the pop-up menu. If there is
more than one high-priority port, repeat this operation.
The Attribute column displays Prio.
5. Right-click a low-priority port and then select Prio -> Non-Prio from the pop-up menu. If there is
more than one low-priority port, repeat this operation.
The Attribute column displays Non-Prio.
You must set the upper limit values for Non-Prio specified ports. For details about the setting of
upper-limit values, see “Setting Upper-Limit Values to Traffic at Non-prioritized Ports” on page 36.
6. Click Apply.
The settings are applied to the storage system.
After you set port priorities, you can follow the procedure for measuring traffic (I/O rates and transfer
rates) (see the HP StorageWorks XP24000/XP20000 Performance Monitor User's Guide).
Setting Upper-Limit Values to Traffic at Non-prioritized Ports
After you analyze traffic statistics, 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 also used to suppress the amount of data to be transferred between the storage
system and the low-priority ports and thus to provide better performance for high-priority host servers.
To limit the I/O rate or transfer rate of a non-prioritized port:
1. Start XP Performance Control (see “Starting Performance Control” on page 34).
The Performance Control window is displayed.
2. Click the Port tab (Figure 3 on page 18).
3. Do one of the following:
XP Performance Control Operations36