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by adrianco
5534 days ago
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There isn't a 50% extra hardware cost. You spread systems over three zones and run at the normal utilization levels of 30-60%. If you lose a zone while you are at 60% you will spike to 90% for a while, until you can deploy replacement systems in the remaining zones. Traffic spikes mean that you don't want to run more than 60% busy anyway. |
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