Wednesday 28 January 2015

Scale-up Scale-out in computers

Scale-up: x-->X
Scale-up mean you are going to increase or change the existing environment. Ex: If you 1TB 60GB Server, if you add 1TB 60GB additional then it will be Scale-up. To do scale-up, you have Shutdown the server. It will leads to down time the application.
In scale-up, ip address of the system will not change. So no need to bother about ip address.

Scale-out: x + x + x + x....
Scale-out mean you are going to add additional capacities to exiting system, without disturbing the existing system. No need of down time, you can add or remove without down time.
In scale-out, ip address of the each server will be different, so how can we connect different servers?
Ans is load balancer. Load balancer will provide one public address, so always we have to connect that publiv address, no need to bother about individul server ips.