hai,

  can anyone explain main difference between workload management and high availability. 

Saravana,

The concept of high availability is that the system will still function for its users even if a problem occurs with one or more AppServers/Servers/DBs on the backend. 

Workload management is really how do I manage all of the incoming work that my users are driving into the system.

I would recommend reading this article and anything written by Tom Alcott as he writes extensively in both of these areas.

High availability (again) versus continuous availability
www.ibm.com/developerworks/websphere/tec...

Drew

Thank you Drew.

hi drew ,
 i have gone through the document ,but unable to unnderstand could you please add some more points


thanks, 

Ok.. I'll try to make it simple. So dont take this as definition :-)

Work Load management - How you distribute the load and manage it.
High Availability - How muchtime your solution/application is available.

Say you have an application. You define that this application must be available 364days in a year. That is application's availability. How do you achieve this? Create a failover system, backup plan, monitoring etc ..

Now you need the response time to be 1-2seconds. This is not covered in above statement of availability. How do you achieve this then? you take multiple servers and distribute the incoming load among them to maintain the response time you need.

cheers 

Thank you joseph for your clear explanation.