Re: Oracle RAC and VIPs

From: Alessandro Vercelli <alever_at_libero.it>
Date: Thu, 10 Jul 2008 17:14:32 +0200
Message-Id: <K3SQC8$0FA0128C151E3D11FB86793A01122103@libero.it>

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_at_freelists.org
To          : oracledbaquestions_at_gmail.com
Cc          : oracle-l_at_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_at_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?
>>
>
>
>
>--
>Bradd Piontek
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Received on Thu Jul 10 2008 - 10:14:32 CDT