Re: DR implementation using Dataguard ... Best Practices ?
Date: Mon, 9 Jun 2008 16:18:53 -0400
We use an alias for the production server and repoint DNS when we bring up the standby. Logs shipped from the activated primary are sent to the "real" IP address of the the old primary which becomes the standby.
On Mon, Jun 9, 2008 at 12:59 PM, Pedro Espinoza <raindoctor_at_gmail.com> wrote:
> On Mon, Jun 9, 2008 at 8:13 AM, VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
> > A production Site is looking to Deploy Dataguard(with RAC) as its DR
> > Solution. Can Hostname / IP Address of DR machines be kept same as
> production? ... is
> > it an advisable practice?
> If you want to keep the same IP, that DR box has to be in the same
> broadcast domain (same VLAN). However, you can't have 2 MAC addresses
> mapped to the same IP; so, you need to shut down that tcp/ip stack,
> but bring it up when the other is down (this is the approach many HA
> solutions provide; there is another way of doing with backhand
> architecture). Given you need to ship redo logs from one site to
> another, both can't have the same active IP address.
> It is possible to have multiple IP addresses for the same
> hostname.tld, but that defeats the purpose of DR. It is kind of
> active-active load balancing set up.