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Re: [dm-devel] dm-cache module



On 22/03/2010 16:05, Heinz Mauelshagen wrote:
On Sun, 2010-03-21 at 00:56 -0400, Ming Zhao wrote:
Hi Mike,

Thank you very much for your advice!

I can revise dm-cache code and resubmit it as you suggested. I would
also love to know Heinz's progress on his implementation and work with
him if there anything I could contribute.
Hi all,

this is a list of the functions of my dm-hstore
device-mapper target implementation:

o caches reads and writes keeping persistent state metadata.
o writes back in order to enhance streaming performance
   on fragmented access pattern.
o can run on top of readonly original device
o if so, writes back any dirty areas when set readwrite
   (useful for tests)
o readonly<->  readwrite access changes supported via message interface
o initializes metadata for extents in cache in the background
   in order to fasten cache construction
o supports cache resizing via message interface or constructor
o keeps metadata persistent by default
o stores CRCs with metadata for integrity checks
o stores versions with metadata to support future metadata migration

Test features only:
o transient cache
o cache write through


Provides very good performance on SSD cache backing stores.

Has been shelved for a while because of other priorities so I need to
rebase it to the actual kernel.

Regards,
Heinz

Hi,

Facebook have just released "FlashCache" : http://github.com/facebook/flashcache
in the documentation we can read :

Flashcache is built using the Linux Device Mapper (DM), part of the Linux Storage Stack infrastructure that facilitates building SW-RAID and other components.

So it's an other implementation of the same concept, no ?


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