As I pointed out in my response, you should distinguish hard and soft
failures.  If one machine fails even catastrophically, you can provide a new
machine to replace it, thus converting a hard failure into a soft one.

The conclusion is the same.  Three machines is vastly better than one or

On Wed, Mar 31, 2010 at 1:12 PM, Henry Robinson <> wrote:

> With majority-based quorums, a 2 node ensemble will fail if either machine
> fails. This is the same as a 1 node ensemble - if one machine fails, the
> ensemble fails.
> But with the 2 nodes, you have (roughly) double the probability of
> experiencing a single failure, with the same failure profile.

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