HP XP P9000 for Compatible High Perf FICON Connectivity Software - Manual (Page 47)

10 Performance Control operations
This topic provides information and instructions for using Performance Control software to perform
upper-limit control.
Overview of Performance Control operations
Procedures for using Performance Control depend on the connection between host bus adapters
(HBAs) and storage system ports. HBAs are adapters contained in hosts and serve as host ports
for connecting the hosts and the storage system.
If one-to-one connections are established between host bus adapters and ports, you specify the
priority of I/O operations, upper limit value, and threshold value on each port. Because one port
connects to one HBA, you can define the server priority by the port.
However, if many-to-many connections are established between host bus adapters and ports, you
cannot define the server priority by the port, because one port can connect to multiple host bus
adapters, and also multiple ports can connect to one host bus adapter. Therefore, in the
many-to-many connection environment, you specify the priority of I/O operations and upper limit
value on each host bus adapter. In this case, you specify one threshold value for the entire storage
system.
If one-to-one connections are established between host bus adapters and ports, you use the Port
tab of the Performance Control main window. If many-to-many connections are established between
host bus adapters and ports, you use the WWN tab of the Performance Control main window.
This topic explains the operation procedures in each tab.
If one-to-one connections link HBAs and ports
The next figure shows an example of a network in which each host bus adapter is connected to
only one port on the storage system (henceforth, this network is referred to as network A). Host
bus adapters and the storage system ports are directly connected and are not connected via hubs
and switches.
Figure 10 Network A (1-to-1 connections between HBAs and ports)
If one-to-one connections are established between HBAs and ports, take the following major steps:
Overview of Performance Control operations 47