Node recovery

 

The steps necessary for recovering a failed node, either the Deployment Manager or a base node, are explained by using two different methods in this section. The decision which method to use depends on individual requirements and general conditions of your environment, for example, backup storage cost, budget, software licenses for backup software, mean time to repair, service level agreements, etc. These recovery methods are as follows:

1. Using a conventional filesystem backup

2. Using the backupConfig and restoreConfig command-line tools

Note The recommended way for system recovery is to use the first method, a filesystem based backup and recovery. This recommendation is based on the following two reasons:

The addNode command used in the backupConfig recovery method does not work in versions prior to WebSphere V5.1.
The backupConfig method does not address SSL keyring files and other property files, while a filesystem backup of <WAS_HOME> includes these important files.

We assume that the failed node has been either repaired or replaced up to the point where the IBM WAS Network Deployment V5.1 prerequisites are met again (that is, hardware requirements are met, the operating system and all required OS fixes are installed). See the WAS V5.1 hard- and software requirements at:

http://www.ibm.com/software/webservers/appserv/doc/latest/prereq.html

Regardless of the recovery method, we always start with a re-install of WAS V5.1 so that the system registry is set up correctly.

Tip: Consider installing the software using response files to avoid errors during the (repeated) product and fixes installation and for a quick and silent (unattended) setup process. For detailed information about silent product installation, refer to Chapter 6.4. in IBM WAS V5.0 System Management and Configuration: WebSphere Handbook Series, SG24-6195 or to the WebSphere V5.1 InfoCenter.

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IBM is a trademark of the IBM Corporation in the United States, other countries, or both.