Performing Maintenance on an NLB Cluster Node
To perform maintenance on an NLB cluster node, the administrator can temporarily stop the NLB service on the node in the cluster, perform the upgrade, and start it back up later. Stopping the cluster node without impacting user connections requires the use of the Drainstop option from the Network Load Balancing Manager. The Drainstop option informs the NLB cluster that the particular node will be stopped and no new connections should be directed toward this node. All existing connections will remain up and running, and when all the sessions are closed, the NLB service will be shut down on the designated node. After the maintenance has completed, the NLB service can be restarted on the NLB node, and ...
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