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Load Sharing vs Load Balancing

 
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Hi
Whats the difference between them. At one of the mocks It is said that round robin is Load Sharing. Why?
Thank you
Murat
 
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IMHO, load sharing may or may not achievs the load balancing.
Balancing is an effort to make sure that each server have almost
the same load. Load sharing is an effect to make each server process
same amout of request. Since it is not guraanteed that each
requst will result in the same process requirement for the server,
load sharing may not achieve the real load balancing. eg, DNS Round Robin load balancing is actually a load sharing mechnism.
 
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In Load balancing some sort of matrix is used to distribute the load evenly e.g CPU usage. In load balancing there is no such matrix used, system is configured in a particular way to distribute load evenly independent of load e.g DNS round robin.
I got this while taking a mock test at www.moelholm.com. It is a good mock test.
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