RE: RAC node distance

Where do you put your third voting disk?

Matt

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Matthew Zito
Chief Scientist
GridApp Systems
P: 646-452-4090
mzito_at_gridapp.com
http://www.gridapp.com

-----Original Message-----

From: oracle-l-bounce_at_freelists.org on behalf of Tyfanie Wineriter Sent: Fri 4/2/2010 7:29 PM
To: 'ORACLE-L'
Subject: RE: RAC node distance  

I'm really not sure why everyone is responding that this would be an "odd request." We are running a stretch rac with about 4 blocks in between our rac servers, and it's running great. We do have a SAN with 2 storage servers (one at each site, of course).. we run them with great load balancing, no interconnect issues. It's a great answer for DR questions like "What if one building has a tree fall on it" or "What happens if the networks to one building gets chopped by a chainsaw" or even "What happens if one center gets flooded".  

I guess it depends on what your DR quest really is.    

~ Tyfanie Wineriter ~  

Database Administrator

University of Oregon

1212 University of Oregon

Eugene, OR 97402-1212

(541) 346-1366  

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Ram Raman
Sent: Wednesday, March 24, 2010 8:21 PM
To: ORACLE-L
Subject: RAC node distance  

Hi  

We have a 2 node RAC for one of our new applications. There are 2 sets of application/web servers; each set located on different building separated by about 3 city blocks. But, both the RAC nodes are in one of the buildings. The management seemed to be inclined to want to separate them in different buildings. To me that does not sound like a great idea, with interconnect traffic and such. Questions:    

1. Are there any sites that use RAC 'geo-cluster' mode?
2. Would running the RAC in 'active-passive' mode help in case of geo cluster type solution? What kind of interconnect is used by sites that have geo cluster type RACs?

PS. I am aware that RAC is not a DR solution, going for a dataguard would be a good DR solution.   

Ram.    

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http://www.freelists.org/webpage/oracle-l Received on Fri Apr 02 2010 - 20:16:43 CDT