From mboxrd@z Thu Jan  1 00:00:00 1970
From: Brett Russ <bruss@netezza.com>
Subject: Re: Why does one get mismatches?
Date: Wed, 20 Jan 2010 17:25:47 -0500
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On 01/20/2010 03:44 PM, Majed B. wrote:
> You can find details on these parameters and their values in md's
> documentation: http://www.mjmwired.net/kernel/Documentation/md.txt
>
> A mismatch count can be checked by writing "check" to the proper file
> as stated in line 376:
> http://www.mjmwired.net/kernel/Documentation/md.txt#376

Sounds like Jon may have a flaky HDD if certain members continually 
throw errors.  Jon, can you check SMART stats on your drives?

for di in a b c d e f g; do smartctl -a /dev/sd$di | grep -i _sect; done

you may have to add another option to smartctl, I forget.

-BR