Hbase cluster configuration

[michael . dagaev]

Hi, all

Does anybody know a rule of thumb to calculate parameters of an Hbase  
cluster.
to handle N read/write requests/sec (100K each) and manage M Tera bytes of  
data ?

For instance, we ran a cluster of 4 hosts: each data node/region server  
host has
2 CPUs 2GHz each, 7.5G RAM, 850G disk. The performance is good enough for  
now,
but what we have to manage 10T with this cluster ?

Thank you for your cooperation,
M.