From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: Slow request warnings on 0.48 Date: Thu, 05 Jul 2012 14:49:17 -0500 Message-ID: <4FF5EFBD.1060603@inktank.com> References: <44469a6e-79a3-4eaa-be25-c47192c8fc80@mailpro> <4FF5D5C3.80207@inktank.com> <45F11B42CB5830479EF0E56A27F4E68D7F4E54@exchange1.ad.100it.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-gg0-f174.google.com ([209.85.161.174]:41519 "EHLO mail-gg0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751004Ab2GETtW (ORCPT ); Thu, 5 Jul 2012 15:49:22 -0400 Received: by gglu4 with SMTP id u4so7825367ggl.19 for ; Thu, 05 Jul 2012 12:49:21 -0700 (PDT) In-Reply-To: <45F11B42CB5830479EF0E56A27F4E68D7F4E54@exchange1.ad.100it.net> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: David Blundell Cc: Alexandre DERUMIER , "ceph-devel@vger.kernel.org" On 07/05/2012 01:43 PM, David Blundell wrote: >> Hi David and Alexandre, >> >> Does this only happen with random writes or also sequential writes? If it >> happens with sequential writes as well, does it happen with rados bench? >> >> -- >> Mark Nelson >> Performance Engineer >> Inktank > > Hi Mark, > > I just ran "rados -p data bench 60 write -t 16" and a few dd tests with no problems at all so at the moment it looks like only random IO triggers the slow writes. > > Please do let me know if there are any other tests that I can do to help track down the cause. > > David Thanks David! We've got some people internally taking a look at this. I'll let you guys know if there is anything else we need! Thanks, Mark -- Mark Nelson Performance Engineer Inktank