From mboxrd@z Thu Jan  1 00:00:00 1970
From: Frank van Maarseveen <frankvm@frankvm.com>
Subject: 2.6.39[.1]: raid1 check blocks jbd on other md more than 120 seconds
 -- workaround
Date: Tue, 7 Jun 2011 10:24:35 +0200
Message-ID: <20110607082435.GA2016@janus>
References: <20110602093644.GA8620@janus>
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I did some more testing and apparently the issue can be avoided by
choosing the deadline scheduler instead of cfq. Either configure the
kernel with

	CONFIG_DEFAULT_IOSCHED="deadline"

or select the deadline I/O scheduler per device. In my case:

	echo deadline >/sys/block/sda/queue/scheduler
	echo deadline >/sys/block/sdb/queue/scheduler


-- 
Frank