From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Thornber <thornber@redhat.com>
Subject: Re: dm-cache - should origin device and cache be
 identical when quiescent?
Date: Fri, 23 Jan 2015 11:21:51 +0000
Message-ID: <20150123112150.GA13163@debian>
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On Fri, Jan 23, 2015 at 12:14:33PM +1000, Alex Sudakar wrote:
>   dmsetup create cache --table '0 1843200 cache /dev/vdb3 /dev/vdb2
> /dev/vdb1 64 1 writeback default 0

Use 'writethrough' rather than 'writeback'.