Migration

Migration tasks and tools allow you to transfer your existing configuration settings and existing applications to the new version of the product.

Product migration functions are provided by the migration tools in IBM WebSphere Application Server, Version 5. This table shows the supported migration paths:

Existing version *	New version
3.5.x Standard Edition	5 Base and Network Deployment
3.5.x Advanced Edition	5 Base and Network Deployment
4.0.x Advanced Single Server Edition	5 Base and Network Deployment
4.0.x Advanced Edition	5 Base and Network Deployment
5.0.x Express	5 Base and Network Deployment

* See Migration prerequisites for the minimum levels required for migration.

This document provides detailed step-by-step instructions to successfully migrate your WebSphere Application Server Version 3.5.x, Version 4.0.x, and Version 5.0.x Express instances to WebSphere Application Server Version 5 (Base) and Network Deployment. The following topics take you through the migration process. It is recommended that you read each topic in the order listed, and that you read through the migration documentation at least once before you start the migration process.

WebSphere Application Server Version 5 can coexist with all previous versions of WebSphere Application Server. Depending on the previous version of WebSphere Application Server, there may be port conflicts which need to be resolved. See Coexistence with previous versions of WebSphere Application Server for more information .

Several articles have been written describing WebSphere Application Server migration. These articles provide overview information as well as detailed information on each of the supported migration paths. See the Related Resources page on the WebSphere Application Server for iSeries Web site for links to these articles.

For more information on the typical migration scenario, see Overview.

	Step 1: Plan your migration This topic describes the steps complete before starting the migration process. It also includes information on how to evaluate your current environment to ensure you meet the requirements for migration.
	Step 2: Migrate your applications This topic describes how to migrate your applications to Version 5. This involves modifying your applications to use the specifications supported by Version 5.
	Step 3: Migrate your WebSphere Application Server instances This topic provides step-by-step instructions to migrate a WebSphere Application Server instance from an earlier version of WebSphere to a new WebSphere Application Server Version 5 instance or to the default WebSphere Application Server Version 5 instance. Additionally, instructions are provided for migrating to WebSphere Application Server Network Deployment Version 5.
	Step 4: Complete the migration This topic describes the manual steps that you might need to perform to complete the migration process. These are steps that are not performed automatically by the WebSphere Application Server migration tools.