Backblaze hard drive reliability for Q1 2016
- The list totals 61,523 hard drives, not 61,590 noted above. We don’t list drive models in this chart of which we have less than 45 drives.
- Several models have an annual failure rate of 0.00%. They had zero hard drive failures in Q1 2016.
- Failure rates with a small number of failures can be misleading. For example, the 8.65% failure rate of the Toshiba 3TB drives is based on one failure. That’s not enough data to make a decision.
- The overall Annual Failure Rate of 1.84% is the lowest quarterly number we’ve ever seen.
Hard Drive Reliability by Manufacturer
- We once had 45 or more drives, but some failed and we couldn’t get replacements of that model and now we have less than 45.
- They were sent to us as part of our Drive Farming efforts a few years back and we only got a few of a given model. We needed drives and while we liked using the same model, we utilized what we had.
- We built a few Frankenpods that contained drives that were the same size in terabytes but had different models and manufacturers. We kept all the drives in a RAID array the same model, but there could be different models in each of the 3 RAID arrays in a given Frankenpod.
What is a failed hard drive?
- The drive will not spin up or connect to the OS.
- The drive will not sync, or stay synced, in a RAID Array (see note below).
- The Smart Stats we use show values above our thresholds.