This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.
CCIE #29033
This blog will continue to include questions, troubleshooting scenarios, and references to existing and new technologies but will grow to include a variety of different platforms and technologies. Currently I have created over 185 questions/answers in regards to the CCIE R&S track!! Note: answers are in the comment field or within "Read More" section.
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I have heard some engineers and administrators claim that their systems are available 100% of the time. I wanted 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.
So.....are you really providing 100% availability?
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