Database Node Spec

Guys,
Need to some rough inputs on my database sizing requirement:
Need to build Oracle 11g dB with year 1 size of approx 470 TB ( with backup maintained for 4 years on seperate server - 4 * 470 TB)
Initially write intensive system...year 2 onwards will be read/write...
Plan to use RAC, Exadata Storage Servers...
Question is:
1) HAs anybody worked on such large scale configuration?
2) how many nodes should be good enough for start?
3) Matrix for CPU and memory requirement ??
Thanks
KS

looks interesting. What are you using currently?
Do you have any benchmarking on how it should perform after 11g db setup?

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