It's fairly simple to start or stop a check but I do wish mdadm's command had this built in.  Sometimes it will do a check at the worst time causing the server to crawl to a halt.

Stop check on md126:

echo idle > /sys/block/md126/md/sync_action

Start check on md126:


echo check > /sys/block/md126/md/sync_action

If you don't want to stop everything you can use this guide to set the minimum and maximum sync speed which does help.

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