WebSphere Virtual Enterprise (formerly Operations Optimization), Version 6.1
             Operating Systems: AIX, HP-UX, Linux, Solaris, Windows, z/OS


Setting maintenance mode

Set maintenance mode before you perform diagnostic tests, maintenance, or tuning on a node or server. Maintenance mode can prevent the disruption of client requests by routing client traffic that is targeted for a server or node that is in maintenance mode to another server or node.

Before you begin

You can set maintenance mode on a server or a node that is represented in the administrative console.

To view the nodes that are configured, click System administration > Middleware nodes. To view all of the servers that are configured, click Servers > All servers.

You can use maintenance mode when you route requests with on demand routers (ODR) or proxy servers. If you are using a Web server to route requests, then maintenance mode is not recognized.

About this task

When a node or server is in running state, the dynamic operations environment considers that node or server to be available for servicing application requests. When problems occur, you must perform diagnostics, maintenance, or tuning on the node or server. Use maintenance mode to stop routing traffic to the node or server while you determine the problem.

When a server is in maintenance mode, the application placement controller cannot control that server. The server does not count toward the minimum or maximum running instances setting for the dynamic cluster. For vertical stacking, the configured maximum minus the number of servers in maintenance mode on the node is used to determine if any servers need to be created on the node. By using this method, the dynamic operations environment does not create or destroy server instances to support the configured maximum number of instances as the dynamic cluster instances move in and out of maintenance mode.

Two routing policies, the permitMM and permitstickyMM routing policies, are work class match actions that you can use to only route HTTP traffic to servers in maintenance mode. See Routing and service policies for more information.

Procedure

Results

HTTP and Session Initiation Protocol (SIP) traffic is no longer routed to the nodes or servers that you have in maintenance mode. Enterprise JavaBeans (EJB) affinity is not broken. Requests with EJB affinity and Java Message Service (JMS) traffic are still routed to the server that is in maintenance mode.

What to do next

The health controller also uses server maintenance mode as an action that is taken when the health policy is breached. For example, if you are using an excessive response time condition, and the response time exceeds the specified maximum for a server, then the server can move to maintenance mode.



Related tasks
Creating health policies
Creating ODRs
Related information
Maintenance mode administrative tasks
Routing and service policies
Task topic    

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Last updated: Oct 30, 2009 6:18:07 PM EDT
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