Setup and Install

Planning the Fabric
Hyper Messaging Protocol (HMP)
Chapter 2
44
Enterprise (Database)
The HMP enterprise configuration illustrated in Figure 2-7 is very popular for running
Oracle RAC 9i.
Superdomes or other large servers make up the Database Tier.
Database Tier nodes communicate with each other using HMP.
Application Tier nodes communicate with each other and to the Database Tier using
TCP/IP.
The HMP enterprise configuration is a scalable solution. If higher performance is
required, or if eliminating single points of failure is necessary, scaling up to the HMP
enterprise configuration with multiple connections between nodes is easily accomplished
(see Figure 2-8).
Although each of the servers in the Application Tier could also have multiple adapter
cards and multiple connections to switches, link and adapter card failover capabilities
are not currently available for HMP.