From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pete Ashdown Subject: kvm + raid1 showstopper bug Date: Thu, 16 Feb 2012 21:57:33 -0700 Message-ID: <20120217045733.GC31397@xmission.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: kvm@vger.kernel.org Return-path: Received: from out01.mta.xmission.com ([166.70.13.231]:39063 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751581Ab2BQE5e (ORCPT ); Thu, 16 Feb 2012 23:57:34 -0500 Received: from in01.mta.xmission.com ([166.70.13.51]) by out01.mta.xmission.com with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1RyFt0-0006ag-De for kvm@vger.kernel.org; Thu, 16 Feb 2012 21:57:34 -0700 Content-Disposition: inline Sender: kvm-owner@vger.kernel.org List-ID: I've been waiting for some response from the Ubuntu team regarding a bug on launchpad, but it appears that it isn't being taken seriously: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/745785 We are running Ubuntu Natty 11.04 with KVM with our storage on RAID10 + drbd. While we were running the resync command, we could expect an IO block during every resync. I eventually disabled resync. Yesterday we had a kernel panic, which I am presuming may trace back to KVM and its interactions with RAID10. I run KVM on some other boxes with some built-in Dell hardware RAIDs. They have been stable for well over a year on Ubuntu 10.04. Here are the 11.04 current versions if that helps. kvm 84+dfsg-0ubuntu16+0.14.0+noroms+0ubuntu4.4 kvm-pxe 5.4.4-7ubuntu2 qemu-kvm 0.14.0+noroms-0ubuntu4.4 drbd8-utils 8.3.9-1ubuntu1 What I'd like to know is if this bug between KVM & RAID1 is known and whether it has been addressed in newer versions of the kernel and/or KVM. I'm on the verge of buying a hardware RAID card to resolve this and I'd rather not have to deal with that. Software RAID is so much nicer to manage.