Backblaze 在 2020 年對機械硬碟的回顧

前幾天 Backblaze 放了 2020 年的回顧資料出來:「Backblaze Hard Drive Stats for 2020」。

整體的 AFR (Annualized Failure Rate) 在 0.93% 左右,而如果照品牌拆開,HGST 的數字依然是最漂亮的 (雖然他現在是 WD 的品牌),大約在 0.36% 左右 (111/(1083774+4663049+372000+820272+275779+3968475)),Toshiba 次之,大約低了平均值一些落在 0.89%,而 Seagate 光是看就就知道會超過 1%...

官方有提到,低於 250,000 drive days 以下的數據僅供參考,因為資料量太少,在統計上無法提供結論:

For drives which have less than 250,000 drive days, any conclusions about drive failure rates are not justified. There is not enough data over the year-long period to reach any conclusions. We present the models with less than 250,000 drive days for completeness only.

然後 WD 本家的硬碟回到戰線了,記得之前基本上算是被唾棄 XDDD

另外一張表則是講到這三年的情況,可以看出來 2020 年的 AFR 數字降了不少,裡面也解釋了為什麼 (看起來就是活下來的穩下來了...):

The answer: It was a group effort. To start, the older drives: 4TB, 6TB, 8TB, and 10TB drives as a group were significantly better in 2020, decreasing from a 1.35% AFR in 2019 to a 0.96% AFR in 2020. At the other end of the size spectrum, we added over 30,000 larger drives: 14TB, 16TB, and 18TB, which as a group recorded an AFR of 0.89% for 2020. Finally, the 12TB drives as a group had a 2020 AFR of 0.98%. In other words, whether a drive was old or new, or big or small, they performed well in our environment in 2020.

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