Hitachi MK-96RD617-08 - Manual (Page 134)

6-2 Server Priority Manager Operation
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
Overview of Server Priority Manager Operations
Procedures for using Server Priority Manager depend on connection between
host bus adapters and storage system ports.
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 Server Priority Manager window. If
many-to-many connections are established between host bus adapters and
ports, you use the WWN tab of the Server Priority Manager window. This
section explains the operation procedures in each tab.
Note: Host bus adapters (HBAs) are adapters contained in hosts and serve as
host ports for connecting the hosts and the storage system.