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Re: [dm-devel] dm-cache warming



On Mon, Jul 29, 2013 at 12:16:11PM +0200, Heinz Mauelshagen wrote:
> 
> Hi,
> 
> dm-cache is a hot-spot cache. Ie. you need multiple accesses to the
> same block to get it promoted into the cache (depending on the
> policy plugin btw).
> 
> If your patterns is one-time-only access type, it ain't warm the cache.

Remember there's the page cache in front of dm-cache too.  You may be
accessing data many times, but not actually hitting the disk with
your requests.

- Joe


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