MySQL XtraDB/Galera Cluster High Availability RamDisk *SuperFast*
OK, 3 Galera nodes, with:


Each having all disk stuff sitting in RAM disks.
Enough RAM to make that possible.
The nodes separated geographically so that a volcano, flood, etc, cannot take out all of them at once.
High speed network.


Notes:


That will allow for full and automatic recovery from one server loss.
The only delay during a failure is switching clients to one of the other two nodes.
But, you may find that the network is the slow point.  (Entanglement has not been perfected yet.)
No snapshots needed.  (You always have 2 other nodes with full copies of the data.)