Tuesday, September 1, 2009

Backblaze's Custom 67 Terabyte Storage 4U Server

Via Backblaze Blog -

At Backblaze, we provide unlimited storage to our customers for only $5 per month, so we had to figure out how to store hundreds of petabytes of customer data in a reliable, scalable way—and keep our costs low. After looking at several overpriced commercial solutions, we decided to build our own custom Backblaze Storage Pods: 67 terabyte 4U servers for $7,867.

In this post, we’ll share how to make one of these storage pods, and you’re welcome to use this design. Our hope is that by sharing, others can benefit and, ultimately, refine this concept and send improvements back to us. Evolving and lowering costs is critical to our continuing success at Backblaze.


The result is a 4U rack-mounted Linux-based server that contains 67 terabytes at a material cost of $7,867, the bulk of which goes to purchase the drives themselves.


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).


A Backblaze Storage Pod isn’t a complete building block until it boots and is on the network. The pods boot 64-bit Debian 4 Linux and the JFS file system, and they are self-contained appliances, where all access to and from the pods is through HTTPS.

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