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@xxxxxxxxx] 
Sent: Monday, April 16, 2007 4:27 PM
To: Michael Fontana
Cc: oracle-l@xxxxxxxxxxxxx
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 !

--
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/
--
http://www.freelists.org/webpage/oracle-l

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