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OCFS2 + DRBD8 + MD mirror + PERC 6/iR + SATA 500GB = serious I/O problems?

I have reports that I/O on a certain filesystem, namely /srv/data1, is intermittently horrific. I've seen it myself and it's true. For example, I run 'ls' /srv/data1 and the output takes 30+ seconds ...