8TB，HGST 磁盘显示出最高的可靠性，累积 45 年未出现故障

发布于 2017-02-01

Backblaze is a low cost cloud backup and storage provider that published drive reliability numbers for 2016.
- It uses self-built pods with 45 or 60 disks. Different pods use different disk sizes and models.
- Three 45-disk pods with 4TB Toshiba disks and one 45-disk pod with 8TB HGST disks went a full year without a spindle failing, which is over 145 and 45 years of aggregate usage without a fault respectively.
- Toshiba rates the 4TB model with a 1-million-hour mean time to failure (MTTF), and the disks in 2016 accumulated 1.2 million hours of usage without failing, surpassing the specification.
The same model of disk has had failures in previous years. There may be a subtle bathtub effect or a lower failure rate in the future.
In 2016, Backblaze had its lowest failure rate of 1.95 percent. Some models are concerning (e.g., 13.6 percent of one older Seagate 4TB disk failed), but Seagate's 6TB and 8TB models perform well. Improvements in storage pod design to reduce vibration may also be a factor.
Backblaze still prefers 8TB Seagates in new pods and has added a 60-drive pod with enterprise-class Seagate 8TB drives.
The smallest disks currently in use by Backblaze are 3TB, and they plan to replace older pods with 3TB disks with new ones in the next year. The new norm will be 8TB as 5TB and 6TB units are hard to get. Mid-range drives don't meet the needs of buyers.

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