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Your drives have a 1/10^14 read error rate according to specs, if you use the formula from serverfault.com/questions/591777/… that gives you a 21.9% chance of rebuild failure. For brand new working drives that is.– Sacha KCommented Feb 10, 2018 at 9:56
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If you really want to try to recover your data you need to stop using and modifying these drives. So 30TB to backup the raw content of the drives and another 24TB where you will re-assemble the data.– Sacha KCommented Feb 10, 2018 at 10:04
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So - in case of I recover my data - what modification to my raid would you suggest? Switch to RAID6?– swatCommented Feb 10, 2018 at 14:19
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I wouldn't use RAID 5 or 6. Do the math, but if I'm not wrong you get a chance of rebuild failure of 16.9% with 5 drives in RAID 6 (so less usable space) and still 21.9% if you add a drive to make it 6 drives in RAID 6.– Sacha KCommented Feb 10, 2018 at 15:04
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