Backblaze, which provides cloud storage services, released statistics on solid-state drive failures for the first and second quarters of 2023. The company warned that the sample was not yet representative enough to actually reflect statistical trends.
Backblaze only began adding SSDs to its storage arsenal in the fourth quarter of 2018. By the end of 2021 there were 2200, a year later 2558, and as of June 30, 2023 there were 3144 SSDs installed on servers. “In this environment, hard drives do much more than just load storage servers. They also store log files and temporary storage server files. Depending on server activity, the boot disk reads, writes, and deletes files dailyBackblaze explained.
The reliability of statistical data increases every day as the impact of outliers is reduced. And this is important to consider, as the 829.55% average annual failure rate (AFR) for Seagate’s 240GB model SSDSCKKB240GZR may seem extremely discouraging – in reality, Backblaze only had two examples of this drive at the beginning of the year, one of which failed shortly after installation. Other models continue to operate at full power, meaning their AFR is 0%, which also means nothing. Representative statistics would be based on a sample of at least 100 SSDs over 10,000 days of operation, the company said. However, you can find that the annual failure rate of SSDs is around 1%, while for HDDs this figure is more than 2%.
However, Backblaze has published its report, and perhaps the most useful thing here is the error rate chart, which, although vaguely, resembles the traditional shape of a “bathtub curve,” a model that shows the error rate of technologies and products. This curve shows how many units of a product are likely to fail during a given lifespan. According to the report’s author, agreement is at 70%, which is surprising given the poor initial data. It turns out that SSDs tend to achieve theoretical failure rates.