That means that 23.3% of failed drives showed no warning from the SMART stats we record. Operational drives with one or more of our five SMART stats greater than zero: 4.2%.įailed drives with one or more of our five SMART stats greater than zero: 76.7%. While no single SMART stat is found in all failed hard drives, here’s what happens when we consider all five SMART stats as a group. SMART Stats We Use to Predict Hard Drive Failureįor the last few years we’ve used the following five SMART stats as a means of helping determine if a drive is going to fail. In this case, the 1TB drive is not marked as a failure, but the SMART data will no longer be logged.
Sometimes a drive will be removed from service even though it has not failed, like when we upgrade a Storage Pod by replacing 1TB drives with 4TB drives. Drives which have failed are marked as such and their data is no longer logged. You can download these logs files from our website.
and create a row in the daily log for each drive. We add in a few elements, such as drive model, serial number, etc. This is done once a day for each hard drive. We use Smartmontools to capture the SMART data. While we’ve looked at SMART stats before, this time we’ll dig into the SMART stats we use in determining drive failure and we’ll also look at a few other stats we find interesting. SMART stands for Self-Monitoring, Analysis, and Reporting Technology and is a monitoring system included in hard drives that reports on various attributes of the state of a given drive. What if a hard drive could tell you it was going to fail before it actually did? Is that possible? Each day Backblaze records the SMART stats that are reported by the 67,814 hard drives we have spinning in our Sacramento data center.
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