Re: RAC Configuration - Websphere Configuration

  • From: Sanjay Mishra <smishra_97@xxxxxxxxx>
  • To: Alex Gorbachev <ag@xxxxxxxxxxxx>
  • Date: Wed, 2 Apr 2008 07:10:53 -0700 (PDT)

Thanks Alex


----- Original Message ----
From: Alex Gorbachev <ag@xxxxxxxxxxxx>
To: smishra_97@xxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Sent: Wednesday, April 2, 2008 8:31:34 AM
Subject: Re: RAC Configuration - Websphere Configuration

Sanjay,


psrvdb2 service is running only on 3 nodes according on your lsnrctl service 
output - psrvdb2, psrvdb3 and psrvdb4.
When connection comes to the listener it will send it to one of those nodes 
only if you are using SERVICE_NAME=pspsrv as you stated.


If listener decides to route new connection to the local node then it starts 
dedicated server and hands off connection to it. If listener decides to route 
new connection to a remote node, it forwards it to the listener on a remote 
node and that listener starts dedicated process there and hands off connection.


By disabling client side load balancing, you are putting all burden on initial 
connection requests to one single listener. If you don't do too many connection 
requests - that will be fine. But the most important, specifying only one 
address in your client connection string, you introducing single point of 
failure - if your single listener or the whole node goes down, application 
won't be able to connect.


Client side load balancing and connection failover let you avoid relying on a 
single listener and distribute connection requests (not connections themselves) 
amongst all listeners. You can safely add there all 5 listeners and they will 
route connections only to 3 nodes that are running service requested.


Regards,
Alex




On 1-Apr-08, at 11:36 PM, Sanjay Mishra wrote:

Alex
 

I checked and found that it is using Server-side Load balancing. Can you please 
provide your expertise on the following.
 

If I set the Load Balance =off on Websphere level
    - Service pspsrv is meant to run on 3 node
      -> Is the connection will go to all 5 nodes even pspsrv is supposed to go 
for three node. I had Servder Side Load balancing on and both Local and Remote 
Listener is defined.
 
TIA
Sanjay


      
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