Was wondering - when setting up a couple of servers to host emails, you can put two MX records in, giving you redundancy. Is it possible to do a similar thing for a website (i.e a www entry). I'm aware there are companies that use load balancing to achieve this but wanted to know if there was a cheaper way of doing it.
Is it possible to have www redundancy (without spending loads)
- Thread starter wasc
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I looked at round robin DNS for a system at work.
By the time DNS servers have re-cached and the lack of control you have it's not worth implementing.
You may as well either do it properly with dedicated load balancers or ensure you have a good supplier with decent SLA's on network and hardware.
By the time DNS servers have re-cached and the lack of control you have it's not worth implementing.
You may as well either do it properly with dedicated load balancers or ensure you have a good supplier with decent SLA's on network and hardware.
When you say "without spending loads", what kind of figure are you talking? Load balancers are more useful to maintain reliability under heavy load than purely to maintain 100% uptime. There's no reason why a single decent, well-specced dedicated server couldn't achieve that target (from ~£100/month). The next step up being 2 servers and 1 load balancers still gives you a single point of failure so in terms of risk from a PSU going bang, etc you're no better off.
Edit: As for round robin DNS, again that's more useful for load balancing than for maintaining uptime. Regardless of how low you set your TTL, plenty of servers will simply ignore it meaning many of your users could continue to see the downed server for hours/days afterwards.
Edit: As for round robin DNS, again that's more useful for load balancing than for maintaining uptime. Regardless of how low you set your TTL, plenty of servers will simply ignore it meaning many of your users could continue to see the downed server for hours/days afterwards.
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