Some engineers and administrators claim that their systems are
available 100% of the time. Just to ensure that there is a clear
understanding on what 100% availability means. Up-time does not
equal availability; you can have a system that is up but the services may not be
available. You also need to consider maintenance windows as this impacts your
overall availability. If you do not have the ability to do maintenance without
impacting the services that you are providing then your overall availability
percentages take a hit. Other things that may impact your ability of achieving
100% availability includes environmental's such as power, cooling, etc and other
services that are required to provide access to the very services that you are
providing such as internet connectivity, WAN, LAN, SAN, etc....
Below is a chart showing the availability percentages and the expected downtime per year based on these percentages
Below is a chart showing the availability percentages and the expected downtime per year based on these percentages
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