WebSphere Application Server Network Deployment with shared disk

System Automation for Multiplatforms can be used to configure clusters for WebSphere® Application Server.

To automatically mount the shared storage and to start the associated WebSphere Application Server and HTTP server services on the active node, you can introduce cluster management software, such as IBM® Tivoli® System Automation for Multiplatforms. By adding a Service IP on the active node, you allow the system to be always accessible through the same IP or host name. When a failure is detected, System Automation for Multiplatforms switches all resources over to the standby node. Only a brief period of downtime is experienced during failover.

The following diagram shows a WebSphere Application Server Network Deployment cluster that is installed to a highly available shared disk.

There are two nodes in the peer domain; one production node and one standby node. A redundant file system that contains application server files, associated profile and HTTP server directory is shared between the two nodes, but is only mounted on the active node. If the primary node fails, the standby node takes over. This configuration is known as the warm standby model.

The diagram is described in the main body of the topic.

A redundant shared file system that is auto-mounted on multiple servers provides an added mechanism for concurrency control. The shared file system must be configured for redundancy to avoid creating a single point of failure. The mechanism gives a consistent and serializable view of the file system. You can avoid corruption and data loss when multiple clients attempt to read or write to the same files at the same time. To achieve this level of control, you mount the document file directory on the application server from a storage area network (SAN) or a network file system (NFS).

You can configure attached documents for high availability, which makes the shared file system available to all of the application server and HTTP server nodes.



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