From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jon Hardcastle <jd_hardcastle@yahoo.com>
Subject: Re: Why does one get mismatches?
Date: Fri, 22 Jan 2010 08:22:03 -0800 (PST)
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To: linux-raid@vger.kernel.org, Brett Russ <bruss@netezza.com>
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<SNIP>
> 
> Note that if your md device is not in a read-only mode that
> the member states may be changing underneath you as you run
> the above command. Therefore, you should either stop the
> device then run the commands, or at least have the device in
> a read-only mode first.
> 
> -BR
> 

I have just tried this - i umounted all LV and then deactivated the VG. I set to read-only but now any attempt to echo check > sync_action results in

'write error: device or resource busy'

any clues/