From: Joe Thornber <thornber@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: dm-cache warming
Date: Mon, 29 Jul 2013 11:40:07 +0100 [thread overview]
Message-ID: <20130729104006.GC19261@debian> (raw)
In-Reply-To: <51F640EB.6050701@redhat.com>
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
prev parent reply other threads:[~2013-07-29 10:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-26 15:24 dm-cache warming Dave Pitts
2013-07-29 10:16 ` Heinz Mauelshagen
2013-07-29 10:40 ` Joe Thornber [this message]
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