HP XP Array Manager Software - Manual (Page 46)

You can use a Performance Control group to switch priority of multiple HBAs from prioritized to
non-prioritized, or vice versa.
To switch priority:
1. Start XP Performance Control (see “ Starting XP Performance Control ” on page 32).
The Performance Control window is displayed.
2. Click the WWN tab ( Figure 4 on page 20).
3.
In the lower-left tree, select and right-click a Performance Control group ( ).
4. Do one of the following:
• To switch priority from prioritized to non-prioritized, select Prio -> Non-Prio from the pop-up
menu.
• To switch priority from non-prioritized to prioritized, select Non-Prio -> Prio from the pop-up
menu.
5. Click Apply.
The settings in the window are applied to the storage system.
Setting an Upper-Limit Value to HBAs in a Performance Control Group
If all the HBAs in a Performance Control group are non-prioritized WWNs (that is, low-priority HBAs),
you can set an upper-limit value to HBA performance (that is, I/O rate or transfer rate). You can assign
one upper-limit value for one Performance Control group.
For example, suppose that the upper-limit value 100 IOPS is assigned to a Performance Control group
consisting of four HBAs. If the sum of the I/O rate of the four HBAs reaches 100 IOPS, XP Performance
Control controls the system so that the sum of the I/O rates will not exceed 100 IOPS.
To set an upper-limit value for HBAs in a Performance Control group:
1. Start XP Performance Control (see “ Starting XP Performance Control ” on page 32).
The Performance Control window is displayed.
2. Click the WWN tab ( Figure 4 on page 20).
3.
In the lower-left tree, right-click the Subsystem folder or a Performance Control group ( ).
4. If you selected the Subsystem folder, take the following steps:
a. Select IOPS or MB/s from the list at the upper-left corner of the list. Select IOPS if you want
to assign an upper-limit to the I/O rate. Select MB/s if you want to assign an upper-limit to
the transfer rate.
b. To assign an upper-limit to the I/O rate, enter the upper-limit value in the IOPS column of
the list.
To assign an upper-limit to the transfer rate, enter the upper-limit value in the MB/s column
of the list.
TIP:
If you cannot see the IOPS or MB/s column, scroll the list to the left. The column is located
to the right of the list.
If you selected a Performance Control group ( ), take the following steps:
a. Right-click the selected Performance Control group and then select Change upper-limit from
the pop-up menu.
XP Performance Control Operations 46