Re: Oracle RAC and VIPs

From: Dan Norris <dannorris_at_dannorris.com>
Date: Thu, 10 Jul 2008 10:00:05 -0600
Message-ID: <48763205.4000703@dannorris.com>

Nope, the VIP isn't the problem/reason for the failure to restart. If your logfiles indicate differently, then you've got a different problem. Please post the errors and we'll have a look. You shouldn't have to do anything special to restart the failed node. Clusterware will automatically move the VIP resource for that node back to it when it rejoins the cluster.

You might also include a summary of your environment (versions, platform, etc).

Dan

Alessandro Vercelli wrote:

This was a nice explanation, since I'm a newbie in RAC...:)))

Please, let me ask some help for a problem I'm facing with: one (or more?, it has been some weeks ago...) RAC node crashed and the other took its VIP; now I'd like to start the crashed node but it fails, obviously since the VIP depending nodeapp cannot start...

I'm waiting my management to activate a Metalink support, but is there something I can do to in the meanwhile?

Many thanks,

Alessandro 

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>From      : oracle-l-bounce@freelists.org
To          : oracledbaquestions@gmail.com
Cc          : oracle-l@freelists.org
Date      : Thu, 10 Jul 2008 09:15:41 -0500
Subject : Re: Oracle RAC and VIPs







  

The basic gist is this:
 The VIP is a cluster resource managed by the clusterware. Depending on
your OS , you can see it running as a VIP under your public network NIC.
(ifconfig -a on Linux). What happens in a node failure is that the
clusterware brings that VIP resource up on another node so that when clients
attempt connects to that IP, the 'failure' is detected right away and the
client can use the next address in the tnsnames.ora entry (or jdbc url, or
whatever).

Try it out sometime. take a node node, use srvctl to see where the vips are
running and look at the ifconfig to see as well.

On Thu, Jul 10, 2008 at 8:30 AM, Dba DBA <oracledbaquestions@gmail.com>
wrote:

    

I have installed Rac. I know how to create a VIP. I don't understand why
this works. I also don't undertsand why TAF works.

I am connected to node 1, how am I on the fly connected to node 2 if node 1
goes down.

Again, I know the functionality, I just don't know how it works under the
covers.

Can anyone help me out with this?

      

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-- http://www.freelists.org/webpage/oracle-l Received on Thu Jul 10 2008 - 11:00:05 CDT