Process availability and data availability

 

There are two kinds of high availability: process high availability and data high availability.

For example, in a WebSphere system, we have the following processes:

WAS process

WebSphere Node Agent process

WebSphere Deployment Manager process

WebSphere JMS process

WebSphere MQ process

Various database server processes

HTTP server process

Load Balancer process

LDAP server process

Firewall process

Networked file system (for example NFS, AFS®) process

Operation system processes

Even if we make all of these processes highly available, the WebSphere system may still fail due to data availability. Without data availability, the WebSphere system cannot do any meaningful work. Therefore we will discuss how to make the WebSphere data management systems highly scalable and highly available.

Data management is an integral part of a WebSphere production system. It is used for storing:

Administrative repository for the WebSphere administrative servers

Application data for the WASs

Persistent data for Entity EJBs

Persistent session data for WebSphere HTTP sessions

WebSphere security data for the LDAP servers

Transactional log files and other log files

HTML and image files

WebSphere system binaries

Application binaries

Other important data

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

 

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