From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Hennerbichler Subject: Re: Ceph availability test & recovering question Date: Tue, 19 Mar 2013 06:17:44 +0100 Message-ID: <5147F4F8.40505@risc-software.at> References: <86F425174C7E4F418CCF4E62056152E593906F@GDC-CLDMBX-P01.whq.wistron> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from email.edvz.uni-linz.ac.at ([140.78.3.65]:34811 "EHLO email.uni-linz.ac.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756533Ab3CSFRq (ORCPT ); Tue, 19 Mar 2013 01:17:46 -0400 In-Reply-To: <86F425174C7E4F418CCF4E62056152E593906F@GDC-CLDMBX-P01.whq.wistron> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Kelvin_Huang@wiwynn.com Cc: ceph-devel@vger.kernel.org, Eric_YH_Chen@wiwynn.com On 03/17/2013 05:18 AM, Kelvin_Huang@wiwynn.com wrote: > Hi, all Hi, > ... > My question is: > 1.The state of I/O pause is normal when ceph recovering ? I have experienced the same issue. This works as designed, and is probably because of the heartbeat-timeout in "osd heartbeat grace" period set to 20 secs - see: http://ceph.com/docs/master/rados/configuration/mon-osd-interaction/ > 2.The pause time of I/O that can not be avoided when ceph recovering ? You can always lower the grace period and heartbeat time, though I don't know if this is a wise idea. Short networking interruptions might mark your OSD out very quickly then. > 3.How to reduce the I/O pause time ? see the link above, or this link here: http://ceph.com/docs/master/rados/configuration/osd-config-ref/#monitor-osd-interaction > > Thanks!! > -- > 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 > -- DI (FH) Wolfgang Hennerbichler Software Development Unit Advanced Computing Technologies RISC Software GmbH A company of the Johannes Kepler University Linz IT-Center Softwarepark 35 4232 Hagenberg Austria Phone: +43 7236 3343 245 Fax: +43 7236 3343 250 wolfgang.hennerbichler@risc-software.at http://www.risc-software.at