Server Priority Manager Operation
6-9
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
400
I/O rate
(
IO/s
)
200
time
100
300
prioritized WWN
(
wwn01
)
non-prioritized WWN
(
wwn02 and wwn03
)
Figure 6-7
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 at the paths between port 1A and the non-
prioritized WWNs (wwn02 and wwn03) is 200 IO/s. The peak I/O rate at
the paths between port 1C and the non-prioritized WWNs is also 200 IO/s.
The peak I/O rate at the paths between port 2A and the non-prioritized
WWNs is also 200 IO/s. The peak I/O rate at 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
×
4
×
0.90).
If your network is configured as in Figure 6-4, you must do the following in
this order:
a.
In the
WWN
tab, select one of the four ports that the HBAs are
connected to (i.e. ports 1A, 1C, 2A, and 2C).
b.
Set an upper limit to the non-prioritized WWNs (wwn02 and wwn03).
Figure 6-8 is the result of setting the upper limit of 720 IO/s to the paths
between 1A and the non-prioritized WWNs. For details on how to set an
upper limit, see Setting Priority for Ports on the Storage System.
Figure 6-8
Setting Upper Limits
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