From mboxrd@z Thu Jan 1 00:00:00 1970 From: dima Subject: Re: Set nodatacow per file? Date: Tue, 28 Feb 2012 09:51:42 +0900 Message-ID: <4F4C251E.7040601@parallels.com> References: <4F38B8F0.5020506@yahoo.com> <4F471E80.2040809@parallels.com> <4F4B8B02.9080303@parallels.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed To: Return-path: In-Reply-To: List-ID: On 02/28/2012 07:10 AM, Chester wrote: > On Mon, Feb 27, 2012 at 7:54 AM, dima wrote: >> Hello, >> >> Since several people asked to post the results, here they are. >> I tried raw virtio disk with and without -z -C set and also qcow2 virtio >> disk without -z -C set and did not notice any difference in performance at >> all - Redhat 6.2 Minimal installs in 10 minutes in each case. The "abysmal" >> performance as it was some several months ago (like 10 minutes just for >> virtual disk formatting) under the same conditions is no more at least on >> 3.3.0-rc5. > > Just to make sure, this is a _new_ virtual disk right? I can barely > contain my excitement right now. This is amazing progress. Yes, it is a newly created virtual disk. By the way, one thing that slipped out from my message - in case of raw I did pre-allocation of the entire image, but in case of qcow2 I unchecked this box in virt-manager and the disk was "growing" as the system was installing. Nevertheless I did not notice performance degradation during the install. best ~dima