Don’t be Delta: Four pillars of high availability | InfoWorld: "Obviously no matter how great your software and servers, if you don't have redundant network infrastructure, you may not survive. This starts with your switches and routers, includes such equipment as load balancers, and goes a bit beyond. For instance, backup power -- from a reliable provider that routes your power appropriately.
High availability (HA) protects against such problems as a server or service failing.
Let's say the runtime your web service is built on does a core dump. No user should know -- they should simply be routed to another service. To accomplish this, you need to run multiple instances and load balancers, then replicate appropriately.
Disaster recovery (DR) protects against more unlikely events. Often, DR is implemented with relatively low expectations (sometimes hours or even days before recovery) and/or acceptable data loss. I’d argue that on the modern internet, recovery should be minutes at worst -- same goes for data accessibility. To accomplish DR, you need another datacenter that’s geographically distant and an ironclad failover scheme.
You also need to get the data there.
If you use a cloud hosting provider like AWS, opt for servers in multiple regions in case disaster strikes. Some larger organizations go as far as using more than one cloud infrastructure provider."
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