HP StorageWorks Performance Control XP user guide (T1605-96007, October 2007)

Performance Control XP user guide 15
NOTE: Performance Control XP cannot monitor and control the performance of hosts that have
host bus adapters placed below the Non-Monitor icon.
3. Set the priority of host bus adapters. In the WWN tab of the Performance Control pane, specify the
priority of each host bus adapter.
In network B, the production server is given high priority and the development server is given low
priority. If your network is configured as in Figure 5, you must give high priority to wwn01 and low
priority to wwn02 and wwn03.
To set the priority of host bus adapters, take the following steps (see Figure 6):
a. In the WWN tab, click one of the four ports to which the HBAs are connected (1A, 1C, 3A, or 3C).
b. Set wwn01 to Prio., and set wwn02 and wwn03 to Non-Prio.
Figure 6 Priority specified in the Performance Control pane
NOTE: Throughout this chapter, prioritized WWN refers to a high-priority host bus adapter (such
as wwn01) and non-prioritized port refers to a low-priority host bus adapter (such as wwn02 or
wwn03).
4. Monitor traffic between host bus adapter and ports. Obtain statistics about traffic between host bus
adapter and ports.
There are two types of traffic statistics: I/O rate (number of I/Os per second) and transfer rate (amount
of data transferred between a host and array). When viewing traffic statistics in the Performance
Control pane, select I/O or transfer rate.
If your network is configured like network B, measure the traffic between the three host bus adapters
(wwn01, wwn02, and wwn03) and the four ports (1A, 1C, 2A, and 2C).
Figure 7 illustrates the I/O rate at the paths between port 1A and the host bus adapters. Initially the
I/O rate on the path between 1A and the prioritized WWN (wwn01) was approximately 400 IO/s,
while the I/O rate on the path between 1A and the non-prioritized WWNs (wwn02 and wwn03) was
approximately 100 IO/s. However, the I/O rate for non-prioritized WWNs gradually increased,
while the I/O rate of the prioritized WWN gradually decreased, causing performance of the
high-priority production server to suffer. As network administrator, you might want to maintain the I/O
rate for the prioritized WWN (wwn01) at 400 IO/s.
For detailed information, see ”Measuring traffic between host bus adapters and ports for many-to-many
connections” on page 23 and ”Analyzing traffic statistics” on page 24.
Figure 7 Traffic at ports on network B