From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: RBD fio Performance concerns Date: Fri, 23 Nov 2012 14:24:26 +0100 Message-ID: <50AF790A.5070806@profihost.ag> References: <3ed000f5-38d6-45dd-917e-5e29c5b7ff1a@mailpro> <50AF7798.9060303@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail.profihost.ag ([85.158.179.208]:41037 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751457Ab2KWNYh (ORCPT ); Fri, 23 Nov 2012 08:24:37 -0500 In-Reply-To: <50AF7798.9060303@inktank.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Mark Nelson Cc: Alexandre DERUMIER , ceph-devel , Mark Kampe , =?UTF-8?B?U8OpYmFzdGllbiBIYW4=?= Am 23.11.2012 14:18, schrieb Mark Nelson: > Agreed with Alexandre, try putting the journal on a raw partition. > That's pretty insane! What controller are you using again? Makes no difference. No Controller. Just using the SATA 3.0 onboard=20 Ports for each SSD. fio directly on SSD gives me 45.000 rand 4k write iops and 270Mb/s seq=20 write speed. So that's ok. Stefan > 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=A9bastien 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 ea= ch >>>>> disk >>>>> (/dev/sdX1 for journal 1GB and /dev/sdX2 for OSD) i go down from >>>>> 23.000 >>>>> 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