(Edit: Sheesh, what's with all the downvotes? Hardware failures are a route-aroundable thing that should never cause downtime... as long as you don't adopt an outdated "here sits the one source of truth, and its name is [fat server manually configured]" psychology. HA clustering is at the point where it's a generic, drop-in thing for arbitrary services. If you fail to recognize the above, go do some learning.)
Dated megaliths: 0
(Edit: Sheesh, what's with all the downvotes? Hardware failures are a route-aroundable thing that should never cause downtime... as long as you don't adopt an outdated "here sits the one source of truth, and its name is [fat server manually configured]" psychology. HA clustering is at the point where it's a generic, drop-in thing for arbitrary services. If you fail to recognize the above, go do some learning.)