From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Knecht <markknecht@gmail.com>
Subject: documentation for echo check > /dev/mdX, etc.
Date: Fri, 4 Nov 2011 10:57:44 -0700
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Where do I find documentation on what a command like

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

is doing and where it reports errors if it finds any?

Thanks,
Mark