Backblaze Drive Failure Rate Report
Sep 20, 2022 13:39:01 #
Welcome to the midyear SSD edition of the Backblaze Drive Stats report. 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. 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. Along the way, we’ll offer observations and insights to the data presented and, as always, we look forward to your questions and comments.
Overview
Boot 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. Each day a boot drive will read, write, and delete files depending on the activity of the storage server itself. In our early storage servers, we used HDDs exclusively for boot drives. We began using SSDs in this capacity in Q4 2018. Since that time, all new storage servers, and any with failed HDD boot drives, have had SSDs installed.
Midyear SSD Results by Quarter
As of June 30, 2022, there were 2,558 SSDs in our storage servers. This compares to 2,200 SSDs we reported in our 2021 SSD report. We’ll start by presenting and discussing the quarterly data from each of the last two quarters (Q1 2022 and Q2 2022).
Notes and Observations
Form 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.
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).
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). Neither has enough drives or drive days to reach any conclusions, although they each had zero failures, so nice start.
Crucial 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. Now that our Crucial drives have settled in, we’ve had no failures in either Q1 or Q2. Please call off the dogs.
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%. Of course if any of these models had 1 less failure their AFR would be zero, zip, bupkus, nada – you get it.
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 drive-days in a given quarter as a minimum before we begin to consider the calculated AFR to be “reasonable”. 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.
SSD Lifetime Annualized Failure Rates
As of the end of Q2 2022 there were 2,558 SSDs in our storage servers. The table below is based on the lifetime data for the drive models which were active as of the end of Q2 2022.
Overview
Boot 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. Each day a boot drive will read, write, and delete files depending on the activity of the storage server itself. In our early storage servers, we used HDDs exclusively for boot drives. We began using SSDs in this capacity in Q4 2018. Since that time, all new storage servers, and any with failed HDD boot drives, have had SSDs installed.
Midyear SSD Results by Quarter
As of June 30, 2022, there were 2,558 SSDs in our storage servers. This compares to 2,200 SSDs we reported in our 2021 SSD report. We’ll start by presenting and discussing the quarterly data from each of the last two quarters (Q1 2022 and Q2 2022).
Notes and Observations
Form 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.
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).
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). Neither has enough drives or drive days to reach any conclusions, although they each had zero failures, so nice start.
Crucial 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. Now that our Crucial drives have settled in, we’ve had no failures in either Q1 or Q2. Please call off the dogs.
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%. Of course if any of these models had 1 less failure their AFR would be zero, zip, bupkus, nada – you get it.
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 drive-days in a given quarter as a minimum before we begin to consider the calculated AFR to be “reasonable”. 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.
SSD Lifetime Annualized Failure Rates
As of the end of Q2 2022 there were 2,558 SSDs in our storage servers. The table below is based on the lifetime data for the drive models which were active as of the end of Q2 2022.
Sep 21, 2022 07:46:06 #
Sep 21, 2022 08:12:44 #
Sep 21, 2022 09:13:26 #
Sep 21, 2022 10:27:54 #
I guess my Gerbil Wheel hard drive didn't get tested...I sent extra peanuts....I'll call them.
Sep 21, 2022 11:44:19 #
Interesting. It looks like the SSD is a pretty reliable technology. Unfortunately, most people only have a few of them, so their statistical failure rate is quite high when one of them fails!
No matter how reliable a drive is, it is only as reliable as your BACKUP strategy. If you back up regularly and redundantly and store one copy off site, you'll be ready when a drive fails.
No matter how reliable a drive is, it is only as reliable as your BACKUP strategy. If you back up regularly and redundantly and store one copy off site, you'll be ready when a drive fails.
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