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 15:42:14 +0100 Message-ID: <50AE39C6.5010205@profihost.ag> References: <0a4a4396-60cd-4782-8743-b2bbba2d2488@mailpro> <50AE351F.9080505@profihost.ag> <50AE38C4.6000909@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]:45659 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755357Ab2KVSmX (ORCPT ); Thu, 22 Nov 2012 13:42:23 -0500 In-Reply-To: <50AE38C4.6000909@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 22.11.2012 15:37, schrieb Mark Nelson: > I don't think we recommend tmpfs at all for anything other than playi= ng > around. :) I discussed this with somebody frmo inktank. Had to search the=20 mailinglist. It might be OK if you're working with enough replicas and = UPS. I see no other option while working with SSDs - the only Option would b= e=20 to be able to deaktivate the journal at all. But ceph does not support = this. Stefan > On 11/22/2012 08:22 AM, Stefan Priebe - Profihost AG wrote: >> Hi, >> >> can someone from inktank comment this? Might be using /dev/ram0 with= an >> fs on it be better than tmpfs as we can use dio? >> >> Greets, >> Stefan >> >>> ----- Mail original ----- >>> >>> De: "Stefan Priebe - Profihost AG" >>> =C3=80: "S=C3=A9bastien Han" >>> Cc: "Mark Nelson" , "Alexandre DERUMIER" >>> , "ceph-devel" , >>> "Mark Kampe" >>> Envoy=C3=A9: Jeudi 22 Novembre 2012 14:29:03 >>> Objet: Re: RBD fio Performance concerns >>> >>> Am 22.11.2012 14:22, schrieb S=C3=A9bastien Han: >>>> And RAMDISK devices are too expensive. >>>> >>>> It would make sense in your infra, but yes they are really expensi= ve. >>> >>> We need something like tmpfs - running in local memory but support = dio. >>> >>> 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