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You remove a disk from the array; the array needs rebuilding when it's re-added. The rebuild is automatic, but can take time. However the rebuild time can be minimised if you have a write intent bitmap set on the volume. If the number of changes are small enough then when the disk is re-added it will effectively do a recovery by bringing the "stale" disk ...


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I managed to assemble my raid in the end. This is how you do it: mdadm --assemble --update=devicesize /dev/md2



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