From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Setting disk parameters in a VM Date: Fri, 13 Mar 2009 12:58:26 -0400 Message-ID: <49BA90B2.80804@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: KVM list Return-path: Received: from mail.tmr.com ([64.65.253.246]:46613 "EHLO partygirl.tmr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750946AbZCMQ62 (ORCPT ); Fri, 13 Mar 2009 12:58:28 -0400 Received: from partygirl.tmr.com (partygirl.tmr.com [127.0.0.1]) by partygirl.tmr.com (8.14.2/8.14.2) with ESMTP id n2DGwQiu005124 for ; Fri, 13 Mar 2009 12:58:26 -0400 Sender: kvm-owner@vger.kernel.org List-ID: Based on a discussion in another list on ioschedulers, I added a few lines to my rc.local to set the scheduler to "noop" for disks with model QEMU*, to the scheduling in the VM will not be computing with the scheduling in the host. I wonder if the same thinking applies to the "rotational" feature added to /sys/block in 2.6.29, intended for SSD but probably appropriate for virtual and nbd devices as well. -- Bill Davidsen "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark