RE: RAC Geographical Architecture

Someone else wrote back with a link to a good whitepaper from Oracle published in 2006.

It seemed to imply a 100km limit, between the servers, in geographical terms.

In addition to the added cost for the DWDM (hundreds of thousands$$$$), a site would also need at least four mirrored (remote) copies of disk, with clustering technology (which ain't cheap).

You seem to imply this has been do-able since 2004? And that there are least 10 such sites running it? Amazing.

I would imagine 11g may have even more capability. While I don't normally like to discuss or even consider vaporware, this time my question is based upon putting together a 3-5 year plan for my executives. Any information on future Oracle direction would be helpful. Do you have a link from Oracle?

Thanks for your time and consideration.

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

From: K Gopalakrishnan [mailto:kaygopal_at_gmail.com] Sent: Monday, April 16, 2007 4:27 PM
To: Michael Fontana
Cc: oracle-l_at_freelists.org
Subject: Re: RAC Geographical Architecture

Mike,

Your instructor is right. There is no limitation from RAC side. There are various technologies support this and the most common is DWDM (dark fiber) and there are lot of customers (I have personally participated/known more than 10+ of such) successfully deployed this architecture and running without any problems.

In case if you have my RAC book, I have a dedicated chapter for "Extended RAC". Have a look in near by bookstore

-Gopal

BTW 11g RAC/ASM has some additional features for extended RAC (like preferred read for asm failure groups), however it would be too premature to discuss that now !

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Best Regards,
K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004 http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/

Author: Oracle Database 10g RAC Handbook, Oracle Press 2006 http://www.amazon.com/gp/product/007146509X/
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http://www.freelists.org/webpage/oracle-l Received on Mon Apr 16 2007 - 16:55:42 CDT