The most reliable HDD version Backblaze

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POSTER: computer news   ||   THE MOST RELIABLE HDD VERSION BACKBLAZE	DATE:2016-05-20
Backblaze company  talks about what HDD models have worked the past year, in good faith, and which - out of order.   November 13, 2013: About 50% of hard drive capable of operating for at least six years ; December 6, 2013: Enterprise-class HDD demonstrate comparable reliability to the consumer ; January 22, 2014: Statistics reliability of hard drives as an example of data processing center ; May 13, 2014: Temperature has no significant effect on the service life of hard drive ; September 26, 2014: Backblaze has renewed statistical data on the HDD reliability . January 23, 2015: In search of a reliable HDD 2014. Statistics Backblaze .   And now it is time to analyze the next report, since he was published on the company's website. To date, the company Backblaze in its data center uses 61590 HDD.  This is 9.5% more hard drives than at the time of last year's report.  The total amount of operating time in the 1st quarter of 2016 amounted to more than a billion hours, or 42 million Days or 114,155 years of storage. HDD reliability in the first quarter 2016. The list includes 61523 hard drive, and not 61590 as mentioned above. The reason for this is that the model is not taken into account, which are represented in less than 45 copies; Some models have a zero percent. This means that there was no data on the patterns of failure during the 1st quarter of 2016; When analyzing the failure rates should take into account the number of samples. For example, the failure rate of 8.65% HDD Toshiba 3TB based on just one failed instance; The total failure rate was 1.84% - the lowest quarterly figure in the company's history.   Aggregate indicators of hard drives reliability Statistical data collection staff Backblaze for publishing reports began about three years ago.  The following table is cumulative as of March 31, 2016 for each year starting from April 10, 2013. One billion hours of operation One billion hours is the sum of the duration of all drives.  For example, it includes WDC drives to 1TB, which were be completely removed after the operation from an average of 6 years of operation. In the line Other is taken into account the work of those models that are not listed separately, because they were in operation less than 45 copies. In the above table, HDD Seagate 4TB leader in terms of hours of operation: Early models HGST drives, especially the 2 TB and 3 TB, worked for a long time and provide excellent service during the past few years.  This "time-to-work" at this point outweighs HDD Seagate 4TB volume indicators, introduced in operation in the past year. The relationship between the HDD models on the number of hours worked in a different graphic representation - now in terms of volume: Models volume of 4TB total logged more than 580 million Hours.  We are talking about 48 041 copies, which means an average of 503 days (1.38 years) of operation.  Failure rate models up to 4TB 2.12%. HDD.  Reliability by producers Backblaze uses HDD from four  manufacturers, while dominated by HGST and Seagate.  The following chart shows the data on damage, broken by years and manufacturers. Why do companies generally have a model number of 45 copies? There are several reasons:   Initially, it was more than 45 pieces, but some drives out of service and replaced them on other models HDD; They got to the Backblaze in the program Drive Farming few years ago in an amount of only a few instances of the same model. Backblaze loves standardize equipment and prefers to work with large batches; they were collected from hard drives of equal volume but different models and manufacturers.   If these drives less than 45 pieces, in the statistics, they do not fall, only general information is available on them. Why not Toshiba and Western Digital? The company is often asked why  did not buy more drives Toshiba and Western Digital.  The short answer - "we are tired."  The fact is that now the company needs large batches of disks, 5,000-10,000 copies.  As for Toshiba, then Backblaze does not believe drives the company possessing the best quality / price ratio.  With regard to Western Digital, the Backblaze regularly receive interesting proposals, but every time there are various accidents, which resulted in the deal break down.  Therefore, continuing the purchase of Seagate and HGST solutions.   What is a "defective HDD» in the understanding of the company? Backblaze consider three reasons as defective HDD:   HDD will not spin up or connect to the operating system; HDD is not synchronized or permanently drops out of the RAID-array; SMART parameters beyond thresholds. Related Products :

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