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A good quote about keeping things in balance

03-Jan-11

In certain cases my weaknesses are that I’m too idealistic. Realize that sometimes best is the enemy of better. Sometimes I go for “best” when I should go for “better,” and end up going nowhere or backwards. I’m not always wise enough to know when to go for the best and when to just go for better. Sometimes I’m blinded by “what could be” versus “what is possible,” doing things incrementally versus doing them in one fell swoop. Balancing the ideal and the practical is something I still must pay attention to.
– Steve Jobs

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Availability Classifications

03-Nov-10

I came across an interesting thing today, someone wanted to know what uptime percentages actually mean in “plain english” and in an actual downtime “time” sense.  So, I thought it would be valuable to post…

  • Continuous Processing: 100% uptime (0 minutes downtime per year)
  • Fault Tolerant: 99.999% (5 minutes downtime per year)
  • Fault Resilient: 99.99% (53 minutes downtime per year)
  • High Availability: 99.9% (8.8 hours downtime per year)
  • Normal Commercial Availability: 99 – 99.5% (87.6 – 43.8 hours downtime per year)
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