HP XP Array Manager Software - Manual (Page 25)

5 XP Performance Control Operations
This chapter describes the following XP Performance Control operations:
• Overview of XP Performance Control Operations , page 25
• Starting XP Performance Control , page 32
• Port Tab Operations , page 33
• WWN Tab Operations , page 36
Overview of XP Performance Control Operations
Which procedures you use in XP Performance Control depend on the connection between 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 HBAs 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 HBAs and ports, you cannot define
the server priority by the port, because one port can connect to multiple HBAs, and also multiple ports
can connect to one HBA. Therefore, in the many-to-many connection environment, you specify the
priority of I/O operations and upper-limit value on each HBA. In this case, you specify one threshold
value for the entire storage system.
If one-to-one connections are established between HBAs and ports, you use the Port tab of the
Performance Control window. If many-to-many connections are established between HBAs and ports,
you use the WWN tab of the Performance Control window. This section describes the operation
procedures in each tab.
If One-to-One Connections Link HBAs and Ports
Figure 5 shows an example of a network in which each HBA is connected to only one port on the
storage system (Henceforth, this network is referred to as network A.) HBAs and the storage system
ports are directly connected and are not connected via hubs and switches.
XP24000/XP20000 Performance Control User Guide 25