[dm-devel] dm-cache warming
Joe Thornber
thornber at redhat.com
Mon Jul 29 10:40:07 UTC 2013
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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