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You can use the Command Line Admin Utility to modify the run level of the cluster, or of individual nodes within the cluster. For example, you might want to place nodes in standby mode prior to changing cluster topology or shutting them down.
Transitioning from standby to any of the operational modes (recover, readonly, stall, run) will validate the node's state against the cluster state and will trigger a checkpoint restore if one is warranted. Transitions to readonly or offline modes are also potentially useful: readonly mode halts incorporation of new index data on a node; offline mode will cause the search server to exit.
The Command Line Admin Utility is located in bin\native folder in the Search Service installation folder (for example, C:\bea\alui\ptsearchserver\6.5\bin\native\cadmin.exe).
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