HP XP Array Manager Software - Manual (Page 32)

• Measure traffic between port 2A and the three HBAs.
• Measure traffic between port 2C and the three HBAs.
Figure 11 on page 32 illustrates the I/O rate using the paths between each port and the HBAs.
According to the graph, the I/O rate using the path between 1A and the prioritized WWN
(wwn01) was approximately 400 IO/s at first. The I/O rate using the path between 1A and the
non-prioritized WWNs (wwn02 and wwn03) was approximately 100 IO/s at first. However,
as the I/O rate for non-prioritized WWNs (wwn02 and wwn03) gradually increased from 100
IO/s to 200 IO/s, the I/O rate for the prioritized WWN (wwn01) decreased from 400 IO/s to
200 IO/s. This indicates that the high-priority production server has degraded.
For more information about monitoring traffic, see “
Setting Priority for Host Bus Adapters ” on page
42 and “ Analyzing Traffic Statistics ” on page 41.
Figure 11 Traffic at ports
5. Set an upper-limit to traffic between ports and the non-prioritized WWN to prevent decline in
I/O rates at prioritized WWNs.
When you set an upper-limit for the first time, the upper-limit should be approximately 90 percent
of the peak traffic level.
In network B, the peak I/O rate using the paths between port 1A and the non-prioritized WWNs
(wwn02 and wwn03) is 200 IO/s. The peak I/O rate using the paths between port 1C and the
non-prioritized WWNs is also 200 IO/s. The peak I/O rate using the paths between port 2A
and the non-prioritized WWNs is also 200 IO/s. The peak I/O rate using the paths between
port 2C and the non-prioritized WWNs is also 200 IO/s. So, the recommended upper-limit for
the non-prioritized WWNs is 720 IO/s (= 200 Ч 4 Ч 0.90).
If your network is configured as in
Figure 8 on page 30, you must do the following in this order
(see Figure 12 on page 33):
a. In the WWN tab, select one of the four ports that the HBAs are connected to (that is, ports
1A, 1C, 2A, or 2C).
b. Set an upper-limit to the non-prioritized WWNs (wwn02 and wwn03).
Figure 12 on page 33 is the result of setting the upper-limit of 720 IO/s using the paths between
1A and the non-prioritized WWNs. For details on how to set an upper-limit, see
“
Setting Upper-Limit Values to Traffic at Non-prioritized Ports ” on page 36.
XP Performance Control Operations 32