From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe Subject: Re: poor OSD performance using kernel 3.4 Date: Wed, 30 May 2012 20:26:04 +0200 Message-ID: <4FC6663C.9080301@profihost.ag> References: <4FBE415E.8030702@profihost.ag> <4FC54CDB.1000506@inktank.com> <4FC5BF27.5060704@profihost.ag> <4FC5C941.6010105@profihost.ag> <4FC5FEC1.90103@profihost.ag> <4FC60FC8.207@inktank.com> <4FC61596.3050703@profihost.ag> <4FC61E69.2030408@profihost.ag> <4FC63381.6090300@inktank.com> <4FC63454.3070007@profihost.ag> <4FC6352B.8050501@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.profihost.ag ([85.158.179.208]:59937 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755949Ab2E3S0F (ORCPT ); Wed, 30 May 2012 14:26:05 -0400 In-Reply-To: <4FC6352B.8050501@inktank.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Mark Nelson Cc: Stefan Majer , "ceph-devel@vger.kernel.org" Hi Mark, Am 30.05.2012 16:56, schrieb Mark Nelson: > On 05/30/2012 09:53 AM, Stefan Priebe wrote: >> Am 30.05.2012 16:49, schrieb Mark Nelson: >>> You could try setting up a pool with a replication level of 1 and see >>> how that does. It will be faster in any event, but it would be >>> interesting to see how much faster. >> is there an easier way than modifying the crush map? > > something like: > ceph osd pool create POOL [pg_num [pgp_num]] > then: > ceph osd pool set POOL size VALUE With pool size 1 the writes are constant around 112MB/s: http://pastebin.com/raw.php?i=haDPNTfQ So has it something todo with the replication? Stefan