Software components of a PowerHA SystemMirror node
The software components of a PowerHA® SystemMirror® node has many layers.
The following figure shows the layers of software on a node in a PowerHA SystemMirror cluster:
The following list describes each layer:
- Application layer
- Any applications made highly available through services that are provided by PowerHA SystemMirror for AIX®.
- PowerHA SystemMirror for AIX layer
- Software that recognizes changes within a cluster and coordinates the use of AIX features to create a highly available environment for critical data and applications. PowerHA SystemMirror complements other layers by providing more services to enable applications with their associated communications, and data storage services to be highly available.
- RSCT layer
- The IBM® Reliable Scalable Cluster Technology (RSCT) services are packaged with AIX. The RSCT layer provides facilities for synchronization and coordination of clustering activity by using reliable messaging, in distributed or cluster environments. RSCT includes the Resource Monitoring and Control (RMC), Configuration Resource Manager, and Group Services components.
- Cluster Aware AIX layer
- This extension of the AIX operating system provides facilities for monitoring node membership and network interface health, and event notification.
- AIX layer
- Software that provides the underlying support for a PowerHA SystemMirror cluster.
- Logical Volume Manager (LVM) subsystem layer
- Manages data storage at the logical level.
- TCP/IP subsystem layer
- Provides communications support for a PowerHA SystemMirror cluster.