From mboxrd@z Thu Jan  1 00:00:00 1970
From: Malahal Naineni <malahal@us.ibm.com>
Subject: Re: Is there a way to see updated contents of a	DM
 target's underlying device while the DM target is in use?
Date: Wed, 30 Jun 2010 18:03:09 -0700
Message-ID: <20100701010309.GC24284@us.ibm.com>
References: <4BD43A85686FC34D819098DB1C3999D99E4199BA@orsmsx502.amr.corp.intel.com>
	<20100630230828.GX23989@agk-dp.fab.redhat.com>
	<4BD43A85686FC34D819098DB1C3999D99E419AA2@orsmsx502.amr.corp.intel.com>
	<20100701005156.GY23989@agk-dp.fab.redhat.com>
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Cc: "Riches Jr, RobertX M" <robertx.m.riches.jr@intel.com>
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Alasdair G Kergon [agk@redhat.com] wrote:
> On Wed, Jun 30, 2010 at 04:53:23PM -0700, Riches Jr, RobertX M wrote:
> > I didn't see any queues or caches in dm-linear that would need to be flushed.
> 
> It's your test script that is not behaving as you expect:)
> 
> Add conv=odirect to dd

You mean flags rather than conv? conv just converts ascii to ebcdic etc. 
oflag=direct would do direct I/O on the writes and iflag=direct should do
direct I/O on reads.

Thanks, Malahal.