On Fri, 2013-03-01 at 15:50 -0600, Brassow Jonathan wrote:

Is there a way to periodically scan a RAID array to report any discrepancies?

Yes, it's possible - Redhat distributes a script called raid-check that
is a good example of this very thing.

Documentation/md.txt talks about 'check' and 'repair' as valid words for
sync_action in sysfs.  The number of errors found will be reported to
mismatch_cnt.  These can be found at /sys/block/md#/md for your array.

hth,

Tregaron