Novell LINUX ENTERPRISE 11 - HIGH AVAILABILITY, Manual, Page: 203 / 298

17
Cluster Resources
This chapter summarizes the most important facts and figures related to cluster resources:
the resource agent classes the High Availability Extension supports, the error codes for
OCF resource agents and how the cluster reacts to the error codes, the available resource
options, resource operations and instance attributes. Use this overview as a reference
when configuring resources (either manually with the
crm
line tool or with the Linux
HA Management Client).
17.1 Supported Resource Agent
Classes
For each cluster resource you add, you need to define the standard that the resource
agent conforms to. Resource agents abstract the services they provide and present an
accurate status to the cluster, which allows the cluster to be non-committal about the
resources it manages. The cluster relies on the resource agent to react appropriately
when given a start, stop or monitor command.
Typically, resource agents come in the form of shell scripts. The High Availability
Extension supports the following classes of resource agents:
Legacy Heartbeat 1 Resource Agents
Heartbeat version 1 came with its own style of resource agents. As many people
have written their own agents based on its conventions, these resource agents are
still supported. However, it is recommended to migrate your configurations to High
Cluster Resources 193