RE: Oracle Supported RAC Configuration

From: Freeman, Donald <dofreeman_at_state.pa.us>
Date: Mon, 5 Jun 2006 15:39:30 -0400
Message-ID: <51327ABA927BEF4B96590554CEA7832C060B95B4@enhbgpri05.backup>

We only have two nodes. I know that you need a VLAN if you are going to use more nodes. And, of course the network guys say there is no evidence of any switch failure at the time of the evictions. I am having to answer questions on this today....the other guy is off.

	-----Original Message-----
	From: Matthew Zito [mailto:mzito_at_gridapp.com] 
	Sent: Monday, June 05, 2006 3:26 PM
	To: dofreeman_at_state.pa.us; kevinc_at_polyserve.com;
oracle-l_at_freelists.org
	Subject: RE: Oracle Supported RAC Configuration
	
	
	If I may bridge the gap - Donald is referring to the ethernet

switch, Kevin is referring to Fibre Channel. FWIW, oracle doesn't require a dedicated switch for the interconnect, and in fact, its better to cable the interconnects into both of your core switches and just dedicate a VLAN to the interconnect. However, its rarely the network that actually causes the node evictions, despite Oracle's tendency to point the finger there. If you're really looking towards that, you could do a tcpdump of the interconnect interfaces and drop it into Ethereal and dig into the network packets (or have your network engineer do it).

Matt

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Freeman, Donald

	Sent: Monday, June 05, 2006 3:20 PM
	To: kevinc_at_polyserve.com; oracle-l_at_freelists.org
	Subject: RE: Oracle Supported RAC Configuration
	
	
	Ah...you noticed my imprecise language....I'm the alternate DBA

for this system. I don't normally work on RAC. I'm talking about Node 1 kicking Node 2 out of the cluster.

		-----Original Message-----
		From: oracle-l-bounce_at_freelists.org


[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Kevin Closson

		Sent: Monday, June 05, 2006 2:36 PM
		To: oracle-l_at_freelists.org
		Subject: RE: Oracle Supported RAC Configuration
		
		
		You can use a zoned switch.  What is an "eviction" in

your terminology?

			From: oracle-l-bounce_at_freelists.org


[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Freeman, Donald

			Sent: Monday, June 05, 2006 11:26 AM
			To: oracle-l_at_freelists.org
			Subject: Oracle Supported RAC Configuration
			
			

			We are having an argument with our CoLo facility

over the issue of a dedicated switch for our RAC interconnect. We are saying it's an Oracle requirement and Oracle does not support any other configuration. Of course, I can't find any Metalink source for that requirement. I can't think up any more wild combinations of search terms that will bring me back any fewer than 10k docs. Does anybody have any reference for this "requirement?" We are experiencing periodic evictions from the cluster and wanted to eliminate network issues from our considerations.

			Don Freeman 
			Database Administrator 1 
			Bureau of Information Technology 
			Pennsylvania Department of Health 
			(717) 703-5782

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Received on Mon Jun 05 2006 - 14:39:30 CDT