Hp XP RAID Manager Software User Manual download pdf (Page 51)

3. Set priority to host bus adapters using the WWN tab of the Performance Control main window.

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 13 (page 50), you must give high

priority to wwn01 and also give low priority to wwn02 and wwn03.

To give priority to the three host bus adapters, take the following steps:

• In the WWN tab, select one of the four ports that the HBAs are connected to (i.e., ports

1A, 1C, 2A, and 2C).

• Set Prio. to wwn01. Also, set Non-Prio. to wwn02 and wwn03.

Figure 15 Priority specified in the Performance Control main window

NOTE: The term prioritized WWN to refers to a high-priority host bus adapter (for example,

wwn01). The term non-prioritized port refers to a low-priority host bus adapter (for example,

wwn02 and wwn03).

4. Monitor traffic between host bus adapter and ports. You must obtain statistics about traffic

between host bus adapter and ports.

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.

If your network is configured as network B, you must do the following:

• Measure traffic between the port 1A and the three host bus adapters (wwn01, wwn02

and wwn03.

• Measure traffic between the port 1C and the three host bus adapters (wwn01, wwn02

and wwn03.

• Measure traffic between the port 2A and the three host bus adapters (wwn01, wwn02

and wwn03.

• Measure traffic between the port 2C and the three host bus adapters (wwn01, wwn02

and wwn03.

The following graph illustrates the I/O rate at the paths between each port and the host

bus adapters. According to the graph, the I/O rate at the path between 1A and the

prioritized WWN (wwn01) was approximately 400 IO/s at first. The I/O rate at 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. If you were the network administrator, you probably

would like to maintain the I/O rate for the prioritized WWN (wwn01) at 400 IO/s.

For more information about monitoring traffic, see “Setting priority for host bus adapters”

(page 60) and “Analyzing traffic statistics” (page 59).

If many-to-many connections link HBAs and ports 51

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Hp XP RAID Manager Software User Manual Page 51