[linux-lvm] How does LVM-Cache work?

[Greg Zapp]

I see reference of another dm-cache from ming zhao as far back as
2007.  Found a link here https://github.com/mingzhao/dm-cache.  Does
anybody know the history behind this stuff?  I would have expected one
of these solutions to be pushed upstream by now considering how much
interest is around tiered storage..

On Thu, Feb 28, 2013 at 7:30 AM, Leo Antonio <heiligerstein at gmail.com> wrote:
> Thanks for answers.
>
>
> I take a look in dm-cache-target, I really dont knew this project.
>
> Joe, what is the best way to continue this discussion?
>
> Do you have some documentation besides what is into kernel source, like
> Papers, Architecture Projects etc?
> What is the best way to start to understand this?
>
>
> Thanks!
>
>
> 2013/2/27 <thornber at redhat.com>
>
>> On Tue, Feb 26, 2013 at 03:44:43PM -0300, Leo Antonio wrote:
>> > 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?
>>
>> See my dm-cache target in this branch of my tree:
>>
>> https://github.com/jthornber/linux-2.6/tree/thin-dev
>>
>>
>> https://github.com/jthornber/linux-2.6/blob/thin-dev/drivers/md/dm-cache-target.c
>>
>> There's still a lot of work to do on the policy plug-ins, so if you
>> like to get involved that would be great.
>>
>> - Joe
>>
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>
>
>
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