HP XP P9000 for Compatible High Perf FICON Connectivity Software User Manual
Page 48
1.
Set priority to ports on the storage system using the Port tab of the Performance Control main
window.
In network A, the ports 1A and 1C are connected to high-priority production servers. The port
2A is connected to a low-priority development server. Therefore, the ports 1A and 1C should
be given high priority, and the port 2A should be given low priority.
The next figure shows a portion of the Performance Control main window where the
abbreviation Prio. indicates that the associated port is given high priority, and the abbreviation
Non-Prio. indicates that the port is given low priority.
NOTE:
The term prioritized port is used to refer to a high-priority port, and the term
non-prioritized port is used to refer to a low-priority port.
Figure 11 Priority specified in the Performance Control main window
2.
Monitor traffic at ports. You must obtain statistics about traffic at each port on the storage
system.
There are two types of traffic statistics: the I/O rate and the transfer rate. The I/O rate is the
number of I/Os per second. The transfer rate is the size of data transferred between a host
and the storage system. When you view traffic statistics in the window, you select either the
I/O rate or the transfer rate. Use the Performance Monitor window of Performance Monitor
to view a line graph illustrating changes in traffic.
The next figure shows the changes in the I/O rate for the three ports (1A, 1C, and 2A).
According to the graph, the I/O rate for 1A and 1C was approximately 400 IO/s at first.
The I/O rate for 2A was approximately 100 IO/s at first. However, as the I/O rate for 2A
gradually increased from 100 IO/s to 200 IO/s, the I/O rate for 1A and 1C decreased from
400 IO/s to 200 IO/s. This fact indicates that the high-priority production servers have suffered
lowered performance. If you were the network administrator, you probably would like to
maintain the I/O rate for prioritized ports (1A and 1C) at 400 IO/s. To maintain the I/O rate
at 400 IO/s, you must set an upper limit to the I/O rate for the port 2A.
For detailed information about monitoring traffic, see
“Setting priority for ports on the storage
and
“Analyzing traffic statistics” (page 54)
.
Figure 12 Traffic at ports
48
Performance Control operations