NEED help to fix cluster design issue of 40 terabytes

[Naveen Chhibber]

I am going to configure 40 tb DATAbase using mysql clustering with 16 datanodes , dual proicessors, 2 replicas

1. how much minimum ram i should need
2. which storage device i shoud use which is cheap ex sam or tera station
3. which interconnect i should use i prefer SCI
4. when you trecommand ram per node then how much index and data memory i should specify in config.ini
5. i there is recommandation to increase data nodes then how much i should need. and i trhat case plase specify data and index memory also

regards
naveen