From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alasdair G Kergon <agk@redhat.com>
Subject: Re: parted issue/question
Date: Wed, 18 Jan 2012 00:38:02 +0000
Message-ID: <20120118003802.GA11769@agk-dp.fab.redhat.com>
References: <4F13ADB3.5070806@redhat.com> <87lip6t157.fsf@rho.meyering.net>
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Try
  blkdev --flushbufs
after any cmd that writes to a dev to see if that makes any difference.

Alasdair