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| Oracle Solaris Cluster Data Services Developer's Guide Oracle Solaris Cluster 4.1

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## Providing Administrative Support for a Resource

Actions that cluster administrators perform on resources include setting and changing resource properties. The API defines the `Validate` and `Update` callback methods so that you can create code that hooks into these administrative actions.

The RGM calls the optional `Validate` method when a resource is created. The RGM also calls the `Validate` method when a cluster administrator updates the properties of the resource or its containing group. The RGM passes the property values for the resource and its resource group to the `Validate` method. The RGM calls `Validate` on the set of cluster nodes that is indicated by the `Init_nodes` property of the resource's type. See Resource Type Properties or the `rt_properties`(5) man page for information about `Init_nodes`. The RGM calls `Validate` before the creation or the update is applied. A failure exit code from the method on any node causes the creation or the update to fail.

The RGM calls `Validate` only when the cluster administrator changes resource or resource group properties, not when the RGM sets properties, or when a monitor sets the `Status` and `Status_msg` resource properties.

The RGM calls the optional `Update` method to notify a running resource that properties have been changed. The RGM runs `Update` after the cluster administrator succeeds in setting properties of a resource or its group. The RGM calls this method on nodes where the resource is online. This method can use the API access functions to read property values that might affect an active resource and adjust the running resource accordingly.

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