Setting up a high availability environment

Before you begin

Why and when to perform this task

To set up a WebSphere Application Server for z/OS high availability environment:

Steps for this task

  1. Configure a WebSphere Application Server for z/OS V server instance (node) on each LPAR that is configured in the Network Deployment cell.
    The deployment manager Server, which is required, must be configured on its own node. It can be configured on either LPAR or on a separate LPAR.
  2. Use the Administrative Console to make sure a location service daemon has been defined on each LPAR that has one or more nodes in the same cell. Modifying location service daemon settings describes how to define a location service daemon it one is not already defined.
  3. Define a V Application Server on each node, and form them into a server cluster (see Creating clusters).
  4. Define the following dynamic virtual IP addresses (DVIPAs) through the z/OS Operating System's Sysplex Distributor.
    • A dynamic virtual IP address as the daemon's IP name for the cell. This IP address enables WLM-balanced workload routing and fail over between the LPARs for IIOP requests.
    • A dynamic virtual IP address as the HTTP transport name for the cell. This IP address enables WLM-balanced routing and fail over between the LPARs for sessionless HTTP requests.

    z/OS Communications Server IP Configuration Guide Version 1 Release 4, SC31-8775-02, describes how to define IP addresses through the z/OS Sysplex Distributor. This publication is available at http://www.ibm.com/servers/eserver/zseries/zos/bkserv/v1r4books.html.

  5. Define a static IP address for each node as an auxiliary HTTP transport name for the cell.
    This IP address enables directed HTTP routing for sessional HTTP requests.
  6. Configure Web server plug-ins in each of the Web servers.
    Configure the plug-ins to use the HTTP DVIPA for sessionless requests and the static IP addresses for sessional requests. See Configuring Web server plug-ins for more information.

Results

After you have set up a high availability environment, you can control application rollout and workload routing.

Related concepts
High availability configuration
Application update procedure in a high availability environment
Related tasks
Controlling application rollout and workload routing in a high availability configuration



Searchable topic ID:   trun_ha_appenviron
Last updated: Jun 21, 2007 9:56:50 PM CDT    WebSphere Application Server for z/OS, Version 5.0.2
http://publib.boulder.ibm.com/infocenter/wasinfo/index.jsp?topic=/com.ibm.websphere.zseries.doc/info/zseries/ae/trun_ha_appenviron.html

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