Re: DR implementation using Dataguard ... Best Practices ?
- From: "Pedro Espinoza" <raindoctor@xxxxxxxxx>
- To: VIVEK_SHARMA@xxxxxxxxxxx
- Date: Mon, 9 Jun 2008 12:59:42 -0400
On Mon, Jun 9, 2008 at 8:13 AM, VIVEK_SHARMA <VIVEK_SHARMA@xxxxxxxxxxx> wrote:
> 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.
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