Hard Drive Bit Error Rate
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is the best choice, ever [1]. There are cases where RAID0 is mathematically proven more reliable than RAID5 [2].
Unrecoverable Read Error Rate
RAID5 should never be used for anything where you value keeping your data. raid 5 ure calculator I am not exaggerating when I say that very often, your data is safer on a single hard drive than
What Happens If The Array Experiences A Ure During The Rebuild Process?
it is on a RAID5 array. Please let that sink in.The problem is that once a drive fails, during the rebuild, if any of the surviving drives experience an unrecoverable read error (URE), unrecoverable read error ure the entire array will fail. On consumer-grade SATA drives that have a URE rate of 1 in 10^14, that means if the data on the surviving drives totals 12TB, the probability of the array failing rebuild is close to 100%. Enterprise SAS drives are typically rated 1 URE in 10^15, so you improve your chances ten-fold. Still an avoidable risk.RAID6 suffers from the same fundamental flaw hard drive failure rates as RAID5, but the probability of complete array failure is pushed back one level, making RAID6 with enterprise SAS drives possibly acceptable in some cases, for now (until hard drive capacities get larger).I no longer use parity RAID. Always RAID10 [3]. If a customer insists on RAID5, I tell them they can hire someone else, and I am prepared to walk away.I haven't even touched on the ridiculous cases where it takes RAID5 arrays weeks or months to rebuild, while an entire company limps inefficiently along. When productivity suffers company-wide, the decision makers wish they had paid the tiny price for a few extra disks to do RAID10.In the article, he has 12x 4TB drives. Once two drives failed, assuming he is using enterprise drives (Dell calls them "near-line SAS", just an enterprise SATA), there is a 33% chance the entire array fails if he tries to rebuild. If the drives are plain SATA, there is almost no chance the array completes a rebuild.[1] http://www.smbitjournal.com/2012/11/choosing-a-raid-level-by...[2] http://www.smbitjournal.com/2012/05/when-no-redundancy-is-mo...[3] http://www.smbitjournal.com/2012/11/one-big-raid-10-a-new-st... Twirrim 764 days ago Note that the 10^14 figure is only what the HDD mfgs publish, and it has been the same for something like a decade. I
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Raid 10 Ure
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Hdd Ure
for Q3 2015 October 14th, 2015 As of the end of Q3 2015, there were 50,228 drives spinning in the Backblaze datacenter. Subtracting boot drives, drive models with less than 45 drives https://news.ycombinator.com/item?id=8306499 and drives in testing systems, we are publishing data on 49,056 hard drives spread across 26 different models, varying from 1.0TB to 8.0TB in size. What’s New for the Q3 2015 Results? In this edition, we are publishing the data on our 1TB drives for the first time. The data was always available in the data files we publish on our Hard Drive Data https://www.backblaze.com/blog/hard-drive-reliability-q3-2015/ web page, but now we’re reporting the data here too. We are also going to include “Average Drive Age” for each model and we’ll summarize the data by manufacturer size as well. Hard Drive Failure Rates Let’s start by breaking down the drives by size and comparing them over time: There’s a lot going on in the chart above, here are a few things to help out: The 2013, 2014, and 2015 failure rates are cumulative for the given year. In the case of 2015 that is through Q3 (September). If the failure rate is listed as 0.00% there were drives in use, but none of the drives failed during that period. If the failure rate is blank, there were no drives in use during that period. The “All Periods” failure rates are cumulative for all data (2013-Q3 2015). The “Max # in Service” column is the maximum number of drives ever in service for the given hard drive model. The “Avg Age (Months)” column is the average age of all the hard drives of the given hard drive model. This is based on SMART 9 data. If the “A
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