Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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#### Roles of a Node

A node is assigned a role during its creation and can take any one of these roles:

- Active: Stores data and allows client access. Active nodes are in mirrored pairs.

- Spare: Allows client access, but does not store data. After initializing data devices, monitors other data nodes to initiate repair if another node becomes unavailable.

- Offline: Provide no services until their role changes. When placed back online, its role can change back to its former role.

- Shutdown: An intermediate step between active and offline, waiting for a spare node to take over its functioning. After the spare node has taken over, the node is taken offline.

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