From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: Ceph benchmarks Date: Mon, 27 Aug 2012 21:18:46 -0500 Message-ID: <503C2A86.8080503@inktank.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-iy0-f174.google.com ([209.85.210.174]:63960 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751002Ab2H1CSv (ORCPT ); Mon, 27 Aug 2012 22:18:51 -0400 Received: by ialo24 with SMTP id o24so9644636ial.19 for ; Mon, 27 Aug 2012 19:18:50 -0700 (PDT) In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: =?ISO-8859-1?Q?S=E9bastien_Han?= Cc: ceph-devel On 08/27/2012 03:47 PM, S=E9bastien Han wrote: > Hi community, > Hi! > For those of you who are interested, I performed several benchmarks o= f > RADOS and RBD on different types of hardware and use case. > You can find my results here: > http://www.sebastien-han.fr/blog/2012/08/26/ceph-benchmarks/ > > Hope it helps :) > > Feel free to comment, critic... :) A couple of thoughts: 1) With so few OSDs going from 1000 to 10000 pgs shouldn't make too muc= h=20 of a difference. It would be concerning if it did! 2) Were the commodity results with SSDs using replication of 3? Also,=20 was that test with the flusher on or off? I'd hope that with 15k drive= s=20 you'd see a bit better throughput with journals on the SSDs. 3) It would be interesting to try these tests without the raid1 and see= =20 if you can max out the bonded interface. 4) I think the R520 backplane is using SAS expanders like in the R515s=20 we have. We've had some performance problems caused either by them or=20 by something goofy going on with our H700 controllers. 5) rados bench tests with smaller requests could be interesting on 15k=20 drives. I typically see about 1-2MB/s per OSD for 4k requests with=20 7200rpm SATA disks. Mark > > Cheers! > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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