From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: Infiniband 40GB Date: Wed, 06 Jun 2012 11:43:50 -0500 Message-ID: <4FCF88C6.1000606@inktank.com> References: <98f9ad93-7b3b-4d07-90d8-ca5a3b5e319b@mailpro> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-ob0-f174.google.com ([209.85.214.174]:58977 "EHLO mail-ob0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754318Ab2FFQnw (ORCPT ); Wed, 6 Jun 2012 12:43:52 -0400 Received: by obbtb18 with SMTP id tb18so10500123obb.19 for ; Wed, 06 Jun 2012 09:43:52 -0700 (PDT) In-Reply-To: <98f9ad93-7b3b-4d07-90d8-ca5a3b5e319b@mailpro> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Alexandre DERUMIER Cc: Amon Ott , ceph-devel@vger.kernel.org, Yann Dupont Hi Alexandre, If you can run blktrace during your test on one of the OSD data disks=20 and send me the results I can take a look at them. Also, the rados=20 bench settings and output would be useful too. Thanks, Mark On 6/6/12 11:05 AM, Alexandre DERUMIER wrote: > Hi, I have rebuild my cluster with ubuntu precise, > > -kernel 3.2 > -ceph 0.47.2 > -libc6 2.15 > -3 nodes - 5 osd (xfs) by node and 1 tmpfs with 5 journal file. > > I had launch rados bench, > and I see again constant writes to xfs.... > > Maybe this is related to tmpfs ? > > > I'll retry with kernel 3.4 from intank tomorrow. > I'll also try with journal on a physical disk with xfs partition. > > I'll keep you in touch. > > > ----- Mail original ----- > > De: "Mark Nelson" > =C3=80: "Alexandre DERUMIER" > Cc: "Amon Ott", ceph-devel@vger.kernel.org, "Yann= Dupont" > Envoy=C3=A9: Lundi 4 Juin 2012 14:59:58 > Objet: Re: Infiniband 40GB > > On 6/4/12 6:40 AM, Alexandre DERUMIER wrote: >> Hi, >> >> I'm currently doing some tests with xfs, debian wheezy with standard= libc6 (2.11.3-3) and 3.2 kernel. >> >> I'm doing some iostats(3 nodes with 5 osd), and I see constant write= s to disks.(as the datas are flushed each second from journal to disk). >> >> Journal is big enough (20GB tmpfs) to handle 30s of write. >> >> Do you think it's related to the missing syncfs() support ? >> >> -Alexandre > > Hi Alexandre, > > I've included some seekwatcher results for rados bench tests using 16 > concurrent 4MB writes on XFS OSD. One shows ubuntu oneiric and the > other precise (ie no syncfs support vs syncfs support in libc). > Unfortunately the original test was on 0.46 and the second test was o= n > 0.47.2, so multiple things changed between the tests. Both were teste= d > with kernel 3.4. Interestingly the seeks/second don't seem to drop mu= ch > but the overall performance has about doubled. This was using a singl= e > 7200rpm disk for the OSD data disk and a seperate 7200rpm disk for th= e > journal in both cases. I'd definitely try 0.47.2 with a new libc thou= gh > and see how that works for you. > > ceph 0.46/oneiric: > http://nhm.ceph.com/movies/mailinglist-tests/xfs-osd0-oneiric-3.4.mpg > > ceph 0.47.2/precise: > http://nhm.ceph.com/movies/mailinglist-tests/xfs-osd0-precise-3.4.mpg > > Mark > > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html