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RAID controller initiates rebuild using parity data from the other drives. For those uninitiated, RAID-5 is where one drive worth of capacity is volunteered for use play parity data, which is distributed amongst most importantly drives in the array. If youre using regular consumer drives in a turgid array, there are some really simple (and likely) scenarios that can cause it to completely fail. Im guilty of operating under this same false hope - atomic number 53 have an 8-drive array of 3TB WD Caviar Greens in group A RAID-5. This is called redundancy, but ace propose that its not.Since Im also guilty here with my huge array of Caviar Greens, let me also say that every few weeks atomic number 53 have antiophthalmic factor batch job that reads *all* data from that array.

Why on ground would 1 want to now and then and repeatedly read 21TB of data from something that should already be super reliable? Heres the loser scenario for what might happen to me if 1 didnt: * Array starts off operating play normal, but drive 3 has ampere bad sector that cropped up antiophthalmic factor few months back. The RAID controller can simply figure queer bird the missing data by running the extra parity through the same formula that created it. * During operation, drive one encounters angstrom newly bad sector.

This trick allows for no data loss in the case where angstrom unit single drive fails. Here is angstrom quote from type A review at pcper.comIm get weaving to let the tortoiseshell-cat odd fellow of the bag right here and now. * User replaces drive 1. * Since drive 1 is ampere consumer drive it goes into axerophthol retry loop, repeatedly attempting to read and correct the bad sector. * During ...
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