The two remaining drives are decidedly consumer focused and have the traditional SSD form factor. It is a server-class drive in an M.2 form factor, but it might be out of the price range for many of us as it currently sells from Dell for $468.65. Of these three, the Dell drive seems the best. Speaking of Confidence Intervals: You’ll notice from the table above that the three drives with the highest lifetime annualized failure rates also have sizable confidence intervals.Ĭonversely, there are three drives with a confidence interval of 1% or less, as shown below: This doesn’t mean that drive models with a confidence interval greater than 1.0% are wrong, it just means we’d like to get more data to be sure. For SSDs we like to see a confidence interval of 1.0% or less between the low and the high values before we are comfortable with the calculated AFR. That was down from 1.04% at the end of 2021, but exactly the same as the Q2 2021 AFR of 0.92%.Ĭonfidence Intervals: In general, the more data you have, and the more consistent that data is, the more confident you are in your predictions based on that data. We’ll see how this works in the next section when we compare SSD and HDD lifetime annualized failure rates over time.įalling failure rate?: The lifetime AFR for all of the SSDs for Q2 2022 was 0.92%. As SSDs age, lifetime failure rates can be used to see trends over time. Lifetime annualized failure rate (AFR): The lifetime data is cumulative over the period noted, in this case from Q4 2018 through Q2 2022. The table below is based on the lifetime data for the drive models which were active as of the end of Q2 2022. SSD Lifetime Annualized Failure RatesĪs of the end of Q2 2022 there were 2,558 SSDs in our storage servers. That said, quarterly data can be volatile, so let’s next take a look at the data for each of these drives over their lifetime. It’s all good man: For any given drive model in this cohort of SSDs, we like to see at least 100 drives and 10,000 drives-days in a given quarter as a minimum before we begin to consider the calculated AFR to be “reasonable”. Of course if any of these models had 1 less failure their AFR would be zero, zip, bupkus, nada – you get it. One strike and you’re out: Three drives had only one failure in a given quarter, but the AFR they posted was noticeable: WDC model WDS250G2B0A – 10.93%, Micron – Model MTFDDAV240TCB – 4.52%, and the Seagate model: SSD – 3.81%. Now that our Crucial drives have settled in, we’ve had no failures in either Q1 or Q2. Neither has enough drives or drive days to reach any conclusions, although they each had zero failures, so nice start.Ĭrucial is not critical: In our previous SSD report, a few readers took exception to the high failure rate we reported for the Crucial SSD (model: CT250MX500SSD1) although we observed that it was with a very limited amount of data. New drive models: In Q2 2022 we added two new SSD models, both from Seagate, the 500GB model: ZA500CM10003 (3 drives), and the 250 GB model: ZA250NM1000 (18 drives). Most drives added: Since our last SSD report, ending in Q4 2021, the Crucial (model: CT250MX500SSD1) lead the way with 192 new drives added, followed by 101 new DELL drives (model: DELLBOSS VD) and 42 WDC drives (model: WDS250G2B0A). We’ll start by presenting and discussing the quarterly data from each of the last two quarters (Q1 2022 and Q2 2022).įorm factors: All of the drives listed above are the standard 2.5” form factor, except the Dell (DELLVOSS VD) and Micron (MTFDDAV240TCB) models each of which are the M.2 form factor. This compares to 2,200 SSDs we reported in our 2021 SSD report. Midyear SSD Results by QuarterĪs of June 30, 2022, there were 2,558 SSDs in our storage servers. Since that time, all new storage servers, and any with failed HDD boot drives, have had SSDs installed. We began using SSDs in this capacity in Q4 2018. In our early storage servers, we used HDDs exclusively for boot drives. Each day a boot drive will read, write, and delete files depending on the activity of the storage server itself. Overviewīoot drives in our environment do much more than boot the storage servers: they also store log files and temporary files produced by the storage server. Along the way, we’ll offer observations and insights to the data presented and, as always, we look forward to your questions and comments. We will review the quarterly and lifetime failure rates for these drives and, later in this report, we will also compare the performance of these SSDs to hard drives we also use as boot drives. This report builds on the 2021 SSD report published previously and is based on data from the SSDs we use as storage server boot drives in our Backblaze Cloud Storage platform. Welcome to the midyear SSD edition of the Backblaze Drive Stats report. Post Syndicated from Andy Klein original
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