What is Fault Tolerance in a virtual world? Sometimes I wonder, what does this ‘fault tolerance’ or a ‘zero-downtime’ means to people at large? How does it make a difference in our lives? Do we really need to know all the technology jargon?  How things function? Probably not. Folks! We don’t need to know all of it. But, we can definitely cherish the benefits coming over to us with the magic words ‘Abracadabra’, what this technology is providing us with ‘a glitch free’ access to our everyday applications that we use. Whether, it is a ‘Facebook’ or a ‘Twitter’ application we are working on or trying to access our email messages, or a mobile applications running on a server hosted far off in a data center or a banking application across the globe. It doesn’t matter, even, if we are digging deep into ‘Big Data’ – performing data mining task or using analytics for businesses, social media marketing, political campaigns, philanthropic activities, astronomical data crunching explori...