Petabytes on a budget: How to build cheap cloud storage tells how to store hundreds of petabytes of customer data in a reliable, scalable way—and keep costs low. Backblaze decided to build their own custom Backblaze Storage Pods: 67 terabyte 4U servers for $7,867. Petabytes on a budget: How to build cheap cloud storage article shows how to make one of these storage pods, and you’re welcome to use this design.
A Backblaze Storage Pod is a self-contained unit that puts storage online. It’s made up of a custom metal case with commodity hardware inside. Specifically, one pod contains one Intel Motherboard with four SATA cards plugged into it. The nine SATA cables run from the cards to nine port multiplier backplanes that each have five hard drives plugged directly into them (45 hard drives in total).
Backblaze decided to build their own server because the price of off-the-shelf storage solutions was 10 times as much (or more) than the raw hard drives. Here’s a comparison chart of the price for one petabyte from various venders: