Drive days represents the number of days the drives were operational during the period of observation, and Backblaze uses 366 because this year is a leap year.Īs the chart shows, the AFR for Q1 2020 was 1.07%, which is the lowest AFR for any quarter since Backblaze started keeping track of failures in 2013 (and back then it had much fewer drives).
The company tracks the number of drives and failures from vendors and various capacities to come up with an estimated annualized failure rate (AFR), which is based on the equation (drive failures/drives days/366) * 100.
The workload is typically steady but not intense. That last stage is how they operate for most of their lives, with some drives being busier than others. As files are deleted, the space is used to write more files. Once the drives are full, most of the activity is reading and some file deletions. Hard drives go through a specific lifecycle when they're put into service at Backblaze. Initially, data is written to the drives until they're almost full. With that many drives deployed, Backblaze has a unique perspective on the durability of different hard drives. Cloud storage provider Backblaze’s quarterly drive performance report shows that hard disks have remarkable resilience despite the abuse they take.īackblaze has storage pods in data center colocations that include more than 129,000 HDDs from various manufacturers, ranging in capacity from 4TB to 16TB. But if they do, it won't be any time soon. Given the continued growth in capacity and performance of enterprise SSDs, it would seem mechanical hard disk drives are set to fade out eventually.
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