Oracle RAC and SGA size

Hello,
I read somewhere that for Oracle RAC environments, it is necessary to size the SGA 10% - 15% bigger than it would be for a normal, single-instance environment. This would be necessary because of the Cache Fusion feature, which creates a global virtual cache between all nodes of the RAC.
I ask you: Does this make any sense, or it is not correct to add 10%-15% to the SGA, compared to a single-instance environment?
Thanks for your attention.

I read it on metalink... on the foruns. But i didin't save the link... still looking for it
I'm doing a study about a new instance that will be created on an environment. I'm just analyzing the memory that will be necessary for the new instance + application, acording to the minimum requirements of the application that will be installed in the environment (this application will use this new instance).

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http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/bus_intl.htm#sthref2435
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Wed Nov 16 15:42:40 2005
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vsnsql=14 vsnxtr=3
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CPU : 1 - type 586
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Krishna Nazare
Newbie
Handle:      Krishna Nazare
Status Level:      Newbie
Registered:      Jul 11, 2011
Total Posts:      16
Total Questions:      8 (8 unresolved)
Name      Krishna
Location      Bangalore
Occupation      Software Architect Please follow the forum etiquette by marking your questions as answered by providing appropriate points if you feel that they have been answered. Please keep the forum clean !!

Oracle RAC and SGA size

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