redis - Use NoSQL on a single box -

i designing software deployed 1 single server. have 1tb data , there more writing reading.

i have option buy server. have option use redis , cassandra. cannot both. doubt if makes sense run nosql on 1 single node. enough speedup on traditional sql database?

this type of questions problematic calls opinion, @ cases highly subjective.

i cannot speak on cassandra's behalf better or worse.

redis in-memory solution - means whether reading or writing, you'll best performance available today. means 1tb of data need fit in 1 server's ram. note you'll need additional ram operate server (os) , redis itself. depending on what/how do, end ram requirement of x2.5-3 data's size. means ~4tb of ram... , that's lot.

if single server requirement isn't hard, i'd loosing it. setup, redis or not, not offer availability off single box. if use cluster, you'll able scale using cheaper, "less good" ;), servers.