![]() hard drives) can lead to a wide variance in quarter to quarter comparisons. WDC: The WDC data demonstrate how having too few data points (i.e. This does not consider the newer HGST drive models branded as WDC as we do not currently have any of those models in operation. The “n/a” values for the WDC drives from Q2 2019 onward indicate there were zero WDC drives being used for customer data in our system during that period. While zero failures over five quarters is notable, the number of drives is not high enough to reach any conclusions. Note, there were no more than 231 drives in service at any one time during that same period. There were no Toshiba drive failures during that period. The 0.00% values for the Toshiba drives from Q3 2017 through Q3 2018 are correct. There were no boot drives or test drives included. The data for each manufacturer consists of all the drive models in service which were used to store customer data. The second is the count of the number of hard drives corresponding to each quarter for each manufacturer. The first is the data used to create the chart. The chart below shows the AFR by manufacturer using quarterly data over the last three years. This type of comparison can reveal trends that can help us identify something that needs further attention. We can also compare the results for a given quarter to other quarters, each their own unique bundle of data. This is the type of data you were looking at when you reviewed the Quarterly Chart for Q2 2020 shown earlier in this report. At the end of the quarter, we bundle that data up into a unit (collection, bag, file, whatever), and name it Q2 2020, for example. At the beginning of each quarter we wipe out all the previous data and we start compiling new information. Quarterly data is just that, data for only that quarter. Below is a table of the drive models we deployed. We deployed 12,063 new drives and removed 1,960 drives via replacements and migration in Q2, giving us a net of 10,103 added drives. Note: The Seagate 16TB drive (model: ST16000NM001G) does show 59 drives and is listed in the report because the one failed drive had not been replaced at the time the data for this report was collected That said, all the data from all of the drive models, including boot drives, is included in the files which can be accessed and downloaded on our Hard Drive Test Data webpage. We use 60 drives as a minimum as there are 60 drives in all newly deployed Storage Pods. Reminiscing aside, when we report quarterly, yearly, or lifetime drive statistics, those models with less than 60 drives are not included in the calculations or graphs. Observant readers might note the model number of those HGST drives and realize they were the last of the drives produced with Hitachi model numbers. On the other end of the spectrum, we still have 25 HGST 4TB drives (model: HDS5C4040ALE630), putting in time in Storage Pods. For example, we have: 20 Toshiba 16TB drives (model: MG08ACA16TA) we are putting through our certification process. There were 192 drives (140,059 minus 139,867) that were not included in the list above because we did not have at least 60 drives of a given model. In comparing drive days with the Toshiba drive, the Seagate 6TB and HGST 8TB drives are just as impressive, having no failures in the quarter yet recording 80,626 and 91,000 drive days respectively in Q2 2020. While the Toshiba 4TB drives recorded less than 10,000 drive days, we have not had a drive failure for that model since Q4 2018, or 54,054 drive days. ![]() During this quarter, three drive models had 0 (zero) drive failures: the Toshiba 4TB (model: MD04ABA400V), the Seagate 6TB (model: ST6000DX000) and the HGST 8TB (model: HUH728080ALE600). One year ago (Q2 2019), the quarterly AFR was 1.8%. In addition, this is the first time the quarterly AFR has been under 1%. ![]() The Q2 AFR number is the lowest AFR for any quarter since we started keeping track in 2013. The Annualized Failure Rate (AFR) for Q2 2020 was 0.81% versus Q1 2020 which was 1.07%. The table below covers what happened in Q2 2020. This leaves us with 139,867 hard drives in our review. For our evaluation we remove from consideration those drive models for which we did not have at least 60 drives (see why below). Quarterly Hard Drive Failure Stats for Q2 2020Īt the end of Q2 2020, Backblaze was using 140,059 hard drives to store customer data. As always, we look forward to your comments. This review looks at the Q2 2020 and lifetime hard drive failure rates of the data drive models currently in operation in our data centers and provides a handful of insights and observations along the way. Of that number, there were 2,271 boot drives and 140,059 data drives. As of June 30, 2020, Backblaze had 142,630 spinning hard drives in our cloud storage ecosystem spread across four data centers. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |