From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kumar amit mehta <gmate.amit@gmail.com>
Subject: Re: dm-cache: dirty state of blocks in writethrough mode
Date: Thu, 25 Jul 2013 22:45:46 -0400
Message-ID: <20130726024546.GA8707@gmail.com>
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On Thu, Jul 25, 2013 at 12:45:31PM +0200, Heinz Mauelshagen wrote:
> You can set up a mirrored metadata device to be resilient against
> SSD failures.

Okay

> Plus you can take metadata snapshots at arbitrary points in time;
> see the targets kernel documentation in thin-provisioning.txt for this
> and the recent thin_dump support metadata snapshots  in the rawhide
> device-mapper-persistent-data package.
>

So these feature is already upstream and also in fedora 20, but not in 
Red Hat 6.4 yet ?

> Either is subject to future LVM2 support and isn't supported as yet.

So, if LVM2 doesn't support it as of now, Any idea if EVMS or any other
volume Managers consume these features?

!!amit