Backblaze Probes Increased Annualized Failure Rate For Its 240,940 HDDs
For over a decade, Backblaze's quarterly reports on the annualized failure rates (AFRs) of its substantial hard disk drives inventory have offered a peek into long-term storage utilization. The company, known for its backup and cloud storage services, has now disclosed data for the second quarter of 2023, revealing a fascinating rise in AFRs. ArsTechnica: Today's blog post details data for 240,940 HDDs that Backblaze uses for data storage around the world. There are 31 different models, and Backblaze's Andy Klein, who authored the blog, estimated in an email to Ars Technica that 15 percent of the HDDs in the dataset, including some of the 4, 6, and 8TB drives, are consumer-grade. The dataset doesn't include boot drives, drives in commission for testing purposes, or drive models for which Backblaze didn't have at least 60 units. One of the biggest revelations from examining the drives from April 1, 2023, through June 30, 2023, was an increase in AFR from Q1 2023 (1.54 percent) to Q2 2023 (2.28 percent). Backblaze's Q1 dataset examined 237,278 HDDs across 30 models. Of course, that AFR increase alone isn't enough to warrant any panic. Since quarterly AFR numbers are "volatile," Klein told Ars Technica, Backblaze further evaluates both quarter-to-quarter and lifetime trends "to see if what happened was an anomaly or something more." So, Klein started digging further by grouping the drives by capacity. This is because, as Klein explained to Ars: "A Backblaze storage vault consists of 1,200 drives of the same size, with 60 drives in 20 storage servers. If we grouped the drives strictly by age and wanted to replace just the oldest drives in a given Backblaze vault, we would only replace those drives in the vault that met the old age criteria, not all the drives. Then, a year from now, we'd do it again, and the year after that, etc. By using the average age by drive size, we can, as appropriate, replace/upgrade all of the drives in a vault at once."
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