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I am going to be rebuilding a raid 1 array. While the rebuild is happening can people still read/write to data in the array?

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Yes, you can use it, it'll underperform obviously and the harder you thrash it the longer the rebuild might take but by all means use it - that's kind of the point of R1 isn't it.

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  • I'd be correct in saying RAID 5 and 6 also apply to this, yes?
    – Steve Byrne
    Sep 1, 2019 at 5:56
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    Correct yes, exactly the same.
    – Chopper3
    Sep 2, 2019 at 14:46

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