RE: Oracle RAC and VIPs

If the VIP comes up on another node, doesn't the attempt to connect to
that (virtual) IP translate to a connect to the other node?  If not, how
exactly is the failure detected right away?
 

Paul Baumgartel 
CREDIT SUISSE 
Information Technology 
Prime Services Databases Americas 
One Madison Avenue 
New York, NY 10010 
USA 
Phone 212.538.1143 
paul.baumgartel@xxxxxxxxxxxxxxxxx 
www.credit-suisse.com 

 

________________________________

From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Bradd Piontek
Sent: Thursday, July 10, 2008 10:16 AM
To: oracledbaquestions@xxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxx>
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
Twitter: http://www.twitter.com/piontekdd
Oracle Blog: http://piontekdd.blogspot.com
Linked In: http://www.linkedin.com/in/piontekdd
Last.fm: http://www.last.fm/user/piontekdd/ 

==============================================================================
Please access the attached hyperlink for an important electronic communications 
disclaimer: 

http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html
==============================================================================

Other related posts: