From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre DERUMIER Subject: Re: Infiniband 40GB Date: Mon, 04 Jun 2012 15:07:03 +0200 (CEST) Message-ID: <09037cad-1a2a-4adb-bedb-91fbdeb5ad79@mailpro> References: <4FCCB14E.6030109@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mailpro.odiso.net ([89.248.209.98]:32950 "EHLO mailpro.odiso.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753225Ab2FDNHZ convert rfc822-to-8bit (ORCPT ); Mon, 4 Jun 2012 09:07:25 -0400 In-Reply-To: <4FCCB14E.6030109@inktank.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Mark Nelson Cc: Amon Ott , ceph-devel@vger.kernel.org, Yann Dupont Thanks Mark, I'll rebuild my cluster with ubuntu precise tomorrow. (Don't have time = to backport/maintain libc6 ;) BTW, do you use mainly ubuntu at intank for your tests ? I'd like to have a setup as close as possible of intank setup. ----- Mail original -----=20 De: "Mark Nelson" =20 =C3=80: "Alexandre DERUMIER" =20 Cc: "Amon Ott" , ceph-devel@vger.kernel.org, "Yann = Dupont" =20 Envoy=C3=A9: Lundi 4 Juin 2012 14:59:58=20 Objet: Re: Infiniband 40GB=20 On 6/4/12 6:40 AM, Alexandre DERUMIER wrote:=20 > Hi,=20 >=20 > I'm currently doing some tests with xfs, debian wheezy with standard = libc6 (2.11.3-3) and 3.2 kernel.=20 >=20 > I'm doing some iostats(3 nodes with 5 osd), and I see constant writes= to disks.(as the datas are flushed each second from journal to disk).=20 >=20 > Journal is big enough (20GB tmpfs) to handle 30s of write.=20 >=20 > Do you think it's related to the missing syncfs() support ?=20 >=20 > -Alexandre=20 Hi Alexandre,=20 I've included some seekwatcher results for rados bench tests using 16=20 concurrent 4MB writes on XFS OSD. One shows ubuntu oneiric and the=20 other precise (ie no syncfs support vs syncfs support in libc).=20 Unfortunately the original test was on 0.46 and the second test was on=20 0.47.2, so multiple things changed between the tests. Both were tested=20 with kernel 3.4. Interestingly the seeks/second don't seem to drop much= =20 but the overall performance has about doubled. This was using a single=20 7200rpm disk for the OSD data disk and a seperate 7200rpm disk for the=20 journal in both cases. I'd definitely try 0.47.2 with a new libc though= =20 and see how that works for you.=20 ceph 0.46/oneiric:=20 http://nhm.ceph.com/movies/mailinglist-tests/xfs-osd0-oneiric-3.4.mpg=20 ceph 0.47.2/precise:=20 http://nhm.ceph.com/movies/mailinglist-tests/xfs-osd0-precise-3.4.mpg=20 Mark=20 --=20 --=20 Alexandre D erumier=20 Ing=C3=A9nieur Syst=C3=A8me=20 =46ixe : 03 20 68 88 90=20 =46ax : 03 20 68 90 81=20 45 Bvd du G=C3=A9n=C3=A9ral Leclerc 59100 Roubaix - France=20 12 rue Marivaux 75002 Paris - France=20 =09 -- 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