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North American Network Operators Group

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RE: Hosting Failover Question

  • From: Paul Froutan
  • Date: Wed Jun 06 19:51:28 2001

Ideally, I wouldn't find any kind of "session" to time out. Almost everyone is fine with short outages (few seconds) as long as their apps don't time out. While 5 seconds is great, I think you'll have a hard time getting there. You'll have to exchange tons of "hello" type packets which means you're flooding a lot of traffic. You can control it at ports, but it's still a pain.

At 6/6/01, you wrote:

I am interested what I should design to.

-----Original Message-----
From: Paul Froutan []
Sent: Wednesday, June 06, 2001 1:23 PM
To: Nanog@Merit. Edu (E-mail)
Subject: Re: Hosting Failover Question

What do you mean by "reasonable"?  Do you mean what you can expect right
now at a hoster, or what you should aim for when designing a system?

At 6/6/01, James DeMong wrote:

>I am looking for a Rule of Thumb on failover for hosting, mostly
>tcp(webserver), some udp (audio/video streaming) stuff.
>My thought is that 5 seconds to failover when a network
>element(switch/router/load balancer/FW) fails is reasonable.
>How many seconds is reasonable for fail over in such a situation?
>Thanks in advance.
>James DeMong
>Network Design Specialist
>TELUS Advanced Communications
>Phone: (403) 503-3718

Paul Froutan                              Email:
Rackspace Managed Hosting                    <>

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