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Sun Cluster 2.2 Software Installation Guide

Data Services Layer

Sun Cluster includes a set of data services that have been made highly available by Sun. Sun Cluster provides a fault monitor at the data services layer. The level of fault detection provided by this fault monitor varies depending on the particular data service. The level is dependent on a number of factors; Refer to the Sun Cluster 2.2 System Administration Guide for details on how the fault monitor works with the Sun Cluster data services.

As the fault monitors probe the servers, they use the local7 message facility. Messages generated by this facility can be viewed in the messages files or on the console, depending on how you have messages configured on the servers. See the syslog.conf(4) man page for details on setting up your messages configuration.

Data Services Supported by Sun Cluster

Sun Cluster provides HA support for various applications such as relational databases, parallel databases, internet services, and resource management data services. The following data services are supported with this release of Sun Cluster. (For the most current list of data services and supported revision levels, see the Sun Cluster 2.2 Release Notes or contact your Enterprise Service provider.)

Data Services API

Sun Cluster software includes an Application Programming Interface (API) permitting existing crash-tolerant data services to be made highly available under the Sun Cluster HA framework. Data services register methods (programs) that are called back by the HA framework at certain key points of cluster reconfigurations. Utilities are provided to permit data service methods to query the state of the Sun Cluster configuration and to initiate takeovers. Additional utilities make it convenient for a data service method to run a program while holding a file lock, run a program under a timeout, or automatically restart a program if it dies.

For more information on the data services API, refer to the Sun Cluster 2.2 API Developer's Guide.