What does horizontal scaling do?
Monday, February 08, 2010
12:47 PM
What does horizontal scaling do? 
If the servers are not too busy, service request time stays roughly the same as for one server, because
Switching time is negligible.  
Datastore behavior dominates server behavior. 
As servers become busy, their computation time becomes a bottleneck resource. 
Switching time is still negligible. 
Response time = datastore response time + service response time. 