From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: RBD fio Performance concerns Date: Thu, 22 Nov 2012 14:14:46 +0100 Message-ID: <50AE2546.9050902@profihost.ag> References: <3210b770-431e-44ed-8d86-4610de89dd92@mailpro> <50ACF8C8.7020908@inktank.com> <50AD02AC.60802@inktank.com> <50ADFC23.2030208@profihost.ag> <50AE1107.5060606@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail.profihost.ag ([85.158.179.208]:48636 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754662Ab2KVSlg (ORCPT ); Thu, 22 Nov 2012 13:41:36 -0500 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: =?ISO-8859-1?Q?S=E9bastien_Han?= Cc: Mark Nelson , Alexandre DERUMIER , ceph-devel , Mark Kampe Am 22.11.2012 13:50, schrieb S=E9bastien Han: >> journal is running on tmpfs to me but that changes nothing. > > I don't think it works then. According to the doc: Enables using > libaio for asynchronous writes to the journal. Requires journal dio > set to true. Ah might be but as the SSDs are pretty fast i don't know which device t= o=20 use as journal except tmpfs. And RAMDISK devices are too expensive. Greets, Stefan > On Thu, Nov 22, 2012 at 12:48 PM, Stefan Priebe - Profihost AG > wrote: >> Am 22.11.2012 11:49, schrieb S=E9bastien Han: >> >>> @Alexandre: cool! >>> >>> @ Stefan: Full SSD cluster and 10G switches? >> >> Yes >> >> >>> Couple of weeks ago I saw >>> that you use journal aio, did you notice performance improvement wi= th it? >> >> journal is running on tmpfs to me but that changes nothing. >> >> 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