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I'm not familiar with mdadm, but 16 drives in RAID6? That's no good. Let's say you've lost one drive. To rebuild, you'll have to do full reads on 15 drives simultaneously for hours. It will be quite stressful for them and chances of next failure will be increased. Hopefully you've mixed different models or at least batches, because failures in a single batch may be correlated. With disk capacities measured in TBs some say that anything less redundant than RAID1 is playing with fire.– gronostajCommented Sep 12, 2022 at 20:22
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They are of different batches over several years, yes. They were not all purchased at the same time or from the same retailer. However they are all the exact same make and model, so that they can successfully be used as whole-drive array members. Not ideal, I know. I have successfully replaced 2 failed drives in this array before, as well as reshaped it several times to add new drives. The disks have seen a lot of I/O.– stiltzkinCommented Sep 12, 2022 at 20:24
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