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Suggest me the cluster configuration.

Suggest me the cluster configuration.

New Contributor
I have a doubt about hadoop cluster.
 
Suppose I have a 500 TB of data to process. And my machine specification is 12 Sata Disks of 3 TB each means total 24 TB capacity of each node. 
 
My quires are
1. How many nodes cluster is required. 
2. How many map and reduce slots will present in each node.(My block size is 128MB)
3. How to figure out how many number of reduce tasks are required. (According to types and number of keys we can determine but if count of key is very high then how to figure out).
 
Thanks,
Raj