From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladimir Bashkirtsev Subject: Ceph and KVM live migration Date: Sun, 01 Jul 2012 10:12:25 +0930 Message-ID: <4FEF9CF1.6030008@bashkirtsev.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.logics.net.au ([150.101.56.178]:42104 "EHLO mail.logics.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932069Ab2GAAms (ORCPT ); Sat, 30 Jun 2012 20:42:48 -0400 Received: from x.logics.net.au (gw.logics.net.au [150.101.235.251] (may be forged)) (authenticated bits=0) by mail.logics.net.au (8.14.5/8.14.1) with ESMTP id q610gPEJ023203 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO) for ; Sun, 1 Jul 2012 10:12:25 +0930 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org Dear all, Currently I testing KVMs running on ceph and particularly testing recent cache feature. Performance is of course vastly improved but still have occasional KVM hold ups - not sure who is at blame ceph of KVM. But I will deal with it later. Right now I've got myself a question which I could not get answered myself: if I do live migration of KVM while there some uncommitted data in ceph cache will this cache be committed prior cut-over to another host? Reading through the list I've got an impression that it may be left uncommitted and thus it may cause data corruption. I just would like a simple confirmation if code which commits cache on cut-over to new host does exist and no data corruption due to RBD cache+live migration should happen. Regards, Vladimir