From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: RBD fio Performance concerns Date: Fri, 23 Nov 2012 07:18:16 -0600 Message-ID: <50AF7798.9060303@inktank.com> References: <3ed000f5-38d6-45dd-917e-5e29c5b7ff1a@mailpro> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-ie0-f174.google.com ([209.85.223.174]:63652 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750838Ab2KWNSP (ORCPT ); Fri, 23 Nov 2012 08:18:15 -0500 Received: by mail-ie0-f174.google.com with SMTP id k11so3325684iea.19 for ; Fri, 23 Nov 2012 05:18:15 -0800 (PST) In-Reply-To: <3ed000f5-38d6-45dd-917e-5e29c5b7ff1a@mailpro> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Alexandre DERUMIER Cc: Stefan Priebe - Profihost AG , ceph-devel , Mark Kampe , =?UTF-8?B?U8OpYmFzdGllbiBIYW4=?= Agreed with Alexandre, try putting the journal on a raw partition.=20 That's pretty insane! What controller are you using again? Mark On 11/23/2012 05:03 AM, Alexandre DERUMIER wrote: > so correcly aligned... > > Maybe try to use journal directly on the full partition, without xfs = ? > > > ----- Mail original ----- > > De: "Stefan Priebe - Profihost AG" > =C3=80: "Alexandre DERUMIER" > Cc: "Mark Nelson" , "ceph-devel" , "Mark Kampe" , "S=C3=A9basti= en Han" > Envoy=C3=A9: Vendredi 23 Novembre 2012 11:49:10 > Objet: Re: RBD fio Performance concerns > > Am 23.11.2012 11:47, schrieb Alexandre DERUMIER: >>>> when i switch the journal to the OSD Disk seperate partiton on eac= h disk >>>> (/dev/sdX1 for journal 1GB and /dev/sdX2 for OSD) i go down from 2= 3.000 >>>> iops to 200 iops random 4k. >> O_o , that's seem crazy... >> Are you sure that your partitions are correctly aligned ? (starting = first partition at sector 2048 is best for ssd) > > Model: ATA INTEL SSDSC2CW24 (scsi) > Disk /dev/sdb: 468862128s > Sector size (logical/physical): 512B/512B > Partition Table: gpt > > Number Start End Size File system Name Flags > 1 2048s 2342911s 2340864s xfs pri > 2 2342912s 468860927s 466518016s xfs pri > > Stefan > -- 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