Remove Failing Disk from MDADM Array

If you need to stop a resync of an MD array, the easiest way to do it is:

echo “idle” > /sys/block/md0/md/sync_action && mdadm –manage /dev/md0 –fail /dev/sda1

Revise the above based on the number of your array and the device that you want to mark as failed. Without the &&, the resync will resume right away. The above will stop the sync and mark the other disk as failed, which can be fixed later.

 

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