Scalability

 Scalability

When number of requests increases ,it determines strength of system is up or down, response time should decrease or it should be maintained.

Vertical Scalability

1 machine having 1 server with high configuration , RAM we can increase , DB Hard Disk we can increase.

PROS                                                                 

Easy Implementation                                                                                                                                   Less Power                                                                                                                                      Management is easy          

CONS

Single Point of Failure : 1 lakh people, RAM Increment, SSD increment .If machine has fault it is down & everything get down.

Limit: There is a  Limit of Hard Disk Increment upto 1TB ,100TB 

Price: Resources added on 1 Machine should be good

Horizontal Scalability

Distributed System 

PROS

No SPOF(Single Point of Failure) : We have copy & replicas of 1 machine get down, we get new.

Cheap Resources can be brought: since not added on only 1 machine , overall price can be less.

CONS

Security tough

Use of high power

Management is difficult.