6 TB does not fit in memory. However, with a good storage engine and fast storage this easily fits within the parameters of workloads that have memory-like perf

6 TB does not fit in memory. However, with a good storage engine and fast storage this easily fits within the parameters of workloads that have memory-like performance. The main caveat is that if you are letting the kernel swap that for you then you are going to have a bad day, it needs to be done in user space to get that performance which constrains your choices.