From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <5225B49B.6050904@redhat.com> Date: Tue, 03 Sep 2013 12:06:19 +0200 From: Marian Csontos MIME-Version: 1.0 References: <521871FD.8000700@mglug.de> In-Reply-To: <521871FD.8000700@mglug.de> Content-Transfer-Encoding: 7bit Subject: Re: [linux-lvm] howto speed-up thinpool-devices? Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development Cc: Oliver Rath On 08/24/2013 10:42 AM, Oliver Rath wrote: > Hi list, > > Im using thinpool-devices (and snapshots, too). I know, thinpool-devices > arent the fastest one, but maybe there could make more use of read (and > maybe write) caching. In my test-system are 32GB of ram, but there is a > max use of cache about <1GB, not more, by heavily use of these devices. Buffers may be more relevant metric as the I/O among snapshots is "shared" on block device level. I am using thin snapshots rather heavily (in VMs) and buffers are using 13 GB of total 32 GB RAM on the machine (and it is not running@full load now) Are you using FS on top of the thin devices? -- Martian > > Is it possible to speed up the reading with growing up the cache use? > The /sys/block/dm-X/.. directories have lots of parameters, but Im not > experienced for that. Maybe Im looking at the wrong place and modifying > kernel parameters (scheduler etc.) are the better way? > > Tfh! > Oliver > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >