Comments on: Repair Your Dell PowerEdge RAID 5 http://www.ncsmartgrowth.org/repair-your-dell-poweredge-raid-5/ Business growth that works for everyone. Thu, 30 Jun 2016 10:46:41 +0000 hourly 1 https://wordpress.org/?v=4.7.5 By: Rex L http://www.ncsmartgrowth.org/repair-your-dell-poweredge-raid-5/#comment-7 Thu, 30 Jun 2016 10:46:41 +0000 http://www.ncsmartgrowth.org/?p=35#comment-7 I am not a computer savvy and even if I am, I would not dare touch my damaged RAID. I will leave it to the experts. I will never take the risk of losing my vital files.

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By: Walter Monat http://www.ncsmartgrowth.org/repair-your-dell-poweredge-raid-5/#comment-8 Tue, 29 Dec 2015 08:23:14 +0000 http://www.ncsmartgrowth.org/?p=35#comment-8 Be mindful of bit error which is the biggest problem with RAID technology today.
In the event of a disk failure in a RAID set, every remaining disk must be read perfectly from start to finish. Any read error during RAID-5 rebuild will cause data loss since we need to read each sector of all other disks during rebuild.

http://www.smbitjournal.com/2012/05/when-no-redundancy-is-more-reliable/

On SATA disks with a bit error rate of 1 in 10^14 (read failure once every 12,5 TB of read operations), that means if the data on the surviving disks totals 12.5TB, the probability of the array failing rebuild is close to 100%. If read failure happens during RAID-6 rebuild, you will be driving without spare tire, vulnerable to 2nd disk failure, from which RAID-6 is supposed to protect in the first place. Enterprise class disks are safer by factor of ten, but still risky.

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