Raid10 calibrating every 0.5 second?

[William Park]

Hi, anyone here running Raid10?

My Raid10 seems to be "calibrating" (so I think) every 0.5 second.  It's
slightly different from "clicking" sound when harddisk is about to die.
So, it's thrashing almost continually if it's mounted, even if there is
no user-level disk activity.  Of course, no sound if it's un-mounted.

I played around with "scheduler" (noop, deadline, cfq), but no
difference.  Any ponters?
-- 
William
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