I am looking for information on the availability rating (i.e. the number of nines or something similar) of servers, primarily Sun machines. I was wondering, does anyone know of a site that has this information?

I have been over Sun's site already and have found very little when it comes to an availability rating. Granted they talk about all the capabilities they have, but do not sum it up into something measurable. Or am I stuck doing the math myself?

I would also like MTBF numbers, but them too are hard to find. Any information you have would be grateful.