A server working by itself is simply just a server or single node. When you have two or more servers that are designed to do the same thing that act like one single system, this is a cluster.
You’re probably reading this because you want to know what virtualization is or how we virtualization. If you haven’t already you might want to read What is virtualisation?.
So hopefully we know what virtualization is. Now let’s look at how we would do this.
When we traditionally talk about a server we’re talking about a physical computer having a operating system with one or more application/s.
Virtualization allows us to separate the hardware (the actual physical computer) from the operating system and applications. Through virtualization no longer are we limited to one physical computer having only one operating system.
This is a very important IT Security principal. Considering these 3 factors we can help guide the design of a system.
Recovery Point Objective (RPO) and Recovery Time Objective (RTO) are important elements which guide major decisions when designing the architecture for a system but whats the difference between the two? Let’s take a look.