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Date: Wed, 27 Feb 2013 10:46:16 +0100
From: Zdenek Kabelac <zdenek.kabelac@gmail.com>
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Subject: Re: [linux-lvm] How does LVM-Cache work?
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To: LVM general discussion and development <linux-lvm@redhat.com>
Cc: Leo Antonio <heiligerstein@gmail.com>

Dne 26.2.2013 19:44, Leo Antonio napsal(a):
> Hello, everyone.
>
> I'm willing to do research about second-level cache using SSDs and I think
> that the best way to do this is using LVM/Device Mapper, because other
> implementations are based on FUSE, virtualization layers, and others.
>
> What I'm trying to do is to develop a subsystem that will put hot blocks/PEs
> on SSDs-Cache, as well as group related blocks/PEs on cache automatically. Not
> simply put on SSD the most  used files or directories.
>
> The problem is that I could not find any documentation about DM or LVM to help
> my research and development.
>
> Could you point me to some documentation or what's the best way to accomplish
> this?

Look for all-caches branch for dm-cache target:
https://github.com/jthornber/linux-2.6/branches

My assumption is - it's most probably already developed and on its way for 
upstream inclusion.

Zdenek