Virty servers' independence promise has been betrayed
Found on The Register on Monday, 08 June 2015
One of the killer selling points of virtualisation is that when a physical cluster node needed fixing, upgrading or taking out of service it is a trivial matter to just migrate the hosts virtual machines onto another cluster node.
In big business, where everything is change controlled to the smallest degree, changes that require host outages can cost several hundreds of pounds by the time all the work is completed. Failing a piece of work because there was a faux cluster node on the host is seen as a big issue.
There always will be failures. Either your hardware goes down, or the cluster; and even the big players in the business had their outages.