Availability and reliability for modular UPS installations

There is one simple reason why data center operators care about availability: It is the measure of how much time per year their ICT resource is operational and available.

Availability is defined as MTBF (Mean Time Between Failures) / MTBF + MTTR (Mean Time To Repair).

Our colleagues at Uninterruptible Power Supplies Ltd. published an article on their website, that shows how availability can be increased: by reducing MTTR as well as by increasing MTBF.

But how can this be done in practice? MTBF can be increased in two ways: First, with N+n redundant systems. Second, with the best quality of the components used.

And what about reducing MTTR?

As an answer to this question UPSL provides a table that shows the effects of redundancy and modularity on MTTR and availability. The results are stunning and help to understand why a modular approach to UPS is a big advantage when it comes to increasing availability:

Table: Effects of redundancy and modularity on availability

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