> - can have 6 (2+2) w/ 0 spares providing 6000 GB with MTTDL of
>     28911.68 years

This should, of course, set off one's common-sense alert.

> it is 91 times more likely to fail and this system will contain data 
> that I don't want to risk losing

If you don't want to risk losing data, you need multiple -- off-site -- copies.

(Incidentally, I rarely see these discussions touch upon what sort of UPS is 
being used. Power fluctuations are a great source of correlated disk failures.)

Anton
 
 
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