Date:  Thu, 08 Feb 2007 19:20:42 +0000
From:  Jason Humphrey <jasonh (at mark) businessws.com>
Subject:  [coba-e:08784] Re: Possible Back-up soloution?
To:  coba-e (at mark) bluequartz.org
Message-Id:  <45CB780A.6000400 (at mark) businessws.com>
In-Reply-To:  <16298339.7811170959206564.JavaMail.root (at mark) z01.pfinders.com>
References:  <16298339.7811170959206564.JavaMail.root (at mark) z01.pfinders.com>
X-Mail-Count: 08784


Herb Rubin wrote:
> Jason,
>
> The only issue with DNS failover is that DNS is cached around the Internet.
> Just because you change the dns entry doesn't mean people can see the backup server
> for up to 24 hours.
>
> That kind of failover requires the Linux High Availability project:
>
> http://www.linux-ha.org/
>
> Of course having a pool of servers showing the same pages is nice but it will
> have its own issues with cookie management across servers, like in PHP applications.
>
> Nothing's perfect.
>
> Herb
>
>   
Surely that just depends on you TTL?? I normally see DNS changes within 
an hour at most 2hours.

Thanks
Jason