Reasons people criticize per-terabyte data warehouse appliance price metrics include:
- Price-per-terabyte metrics ignore issues of throughput, latency, workload, and so on.
- Price-per-terabyte metrics ignore quality of storage medium (slow disks, fast disks, Flash, etc.)
- Price-per-terabyte metrics can be radically affected by changes in disk size.
Not a specialist, but I don’t think the price-per-terabyte includes operational costs either.
Original title and link: Notes on data warehouse appliance prices (NoSQL databases © myNoSQL)