If power goes out before the operation is done, the transact end is missing and the file assumed bad and the table rolled back. They add another few layers to the block sector checksum. Physical failures affect everyone, power failure or not.įile corruption errors are what redundant filesystems like ZFS check for. That said, power loss to a SSD results in FILE CORRUPTION (data) NOT DRIVE FAILURE (physical). If you are on a UPS or laptop, you are covered there too. Some have capacitors which allow all write operations to complete. Another thing is that cheap consumer UPS use batteries, and they are just as likely to catch fire than storage failing from a power interruption.ĭepends on drive and power supply. You can in theory install an uninterruptible power supply behind a PC, which would give you similar power stability as a server, but it would be much cheaper to just back up on more media. PlaneInTheSky said:It's a pointless stat for consumers, because most SSD fail during loss of power or during changes in power.īecause servers are under constant power and have many ways to mitigate loss of power, they are not comparable to consumer PC.īackblaze literally says their data is ONLY applicable to comparable server environments and has no relevance to consumer devices. Hopefully, in the coming years we'll see more recent M.2 SSDs make their way into Backblaze's data - we'd love to see maybe 100 or so each of some PCIe 3.0 and PCIe 4.0 drives, for example, but that of course assumes that the storage servers even support those interfaces. The HDDs incidentally had an AFR of 1.37%.ĭoes this prove SSDs are more reliable than HDDs? Not really, and having a good backup strategy is still critical. Still, data from nearly 3,000 drives is a lot more than what any of us (outside of IT people) are likely to access over the course of a year. That's because no customer data gets stored on the SSDs, so they're only for the OS, temp files, and logs. Ultimately, the number of SSDs in use by Backblaze pales in comparison to the number of hard drives - check the latest Backblaze HDD report, for example, where over 290,000 drives were in use during the past year. It would be nice if the bell curve seen above also correlated with failed drives in some fashion, but with only 25 total failures during the year, that was not to be - Backblaze called its resulting plot "nonsense." There were four observations of a 20C drive, and one instance of a drive at 61C, with most falling in the 25–42 degrees Celsius range. Of course that's just the average, and there are some outliers. Anyway, if you're hoping to see stats for popular drives that might make our list of the best SSDs, you'll be disappointed. But using lots of the same model of hardware keeps things simple when it comes to managing the hardware. They're also generally quite small in capacity, with most drives only offering 250GB of storage, plus about a third that are 500GB, and only three that are larger 2TB drives. First, most of the SSDs that Backblaze uses aren't the latest M.2 NVMe models. Backblaze has been using SSDs for boot drives starting in 2018, and like its hard drive statistics, it's one of few ways to get a lot of insight into how large quantities of mostly consumer drives hold up over time.īefore we get to the stats, there are some qualifications. To be clear, these aren't only boot drives, as they also read and write log files and temporary files, the former of which can sometimes generate quite a bit of wear and tear. Backblaze, purveyor of cloud storage, has published the statistics for the 2,906 SSDs used as boot drives on its storage servers.
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