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Quiescing a high availability node

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Quiesce is a process for cleanly taking a Pega Platform node out of service for maintenance or other activities.

When a node is being quiesced, active users are migrated to an active node when the quiescing node is no longer available.

You can use the Pega API or high availability landing pages to quiesce a node. For more information about these management tools, see Cluster management.

All Pega Platform nodes on a physical or virtual machine must be quiesced before you can perform maintenance on the machine.

Pega Platform offers two types of quiesce: immediate drain (the default), and slow drain. To switch the quiesce method to slow drain, change the value of the session/ha/quiesce/strategy setting in the prconfig.xml file to "slowDrain" and restart the node.

Quiesce a node by using one of the following procedures, depending on how your cluster is configured:

  • Quiescing a node with immediate drain

    On a high availability system, you can remove a node from a pool of active nodes by quiescing the node from a landing page. The default quiesce method is immediate drain, which does not require removing the nodes from the load balancer before starting the quiesce process.

  • Quiescing a node with slow drain

    On a high availability system, you can remove a node from a pool of active nodes by quiescing the node from a landing page. The slow drain method requires removing the nodes from the load balancer before starting the quiesce process. The default quiesce method is immediate drain.


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