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What is Vertical and Horizontal Clustering?

 
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Hi
Can someone please tell me What is Vertical and Horizontal Clustering in weblogic?
Also Vertical and Horizontal scaling of hardware/applications?
Thanks

Deepak
[ December 20, 2004: Message edited by: Deepak Dew ]
 
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Deepak,

Vertical (or linear) clustering is running multiple server instances on the same hardware to better utilize memory or threading and allow for protection against software failure.

Horizontal clustering then is clustering across hardware boundaries for both load balance and failover.

--Dave
 
Deepak Dew
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Thanks Dave,
But in vertical clustering I dont see any advantage apart from better utilization of cpu and memory in comparison with horizontal scaling.
Thanks
Deepak
 
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Vertical Clustering can do 2 things as I know:
Let us take an example: 1 Cluster with 2 application servers running on the same box
1) Protection against software failure: If one of the application server run into problems other server can still take the requests
2) Application update without outage: After updating the Application (Ear), Rolling recycle (One application recycle at a time) of application servers need to be performed. This way one server is available to server the request at any time.

Ravinder
 
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