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Re: [Qemu-devel] [PATCH] QEMU: change default disk cache behavior

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH] QEMU: change default disk cache behavior
Date: Thu, 20 May 2010 15:05:41 +0100

On Thu, May 20, 2010 at 2:49 PM, Jes Sorensen <address@hidden> wrote:
> On 05/20/10 15:40, Anthony Liguori wrote:
>> On 05/20/2010 08:36 AM, Jes Sorensen wrote:
>>>> And I strongly suspect that such a blanket change would be wrong but
>>>> that a more targeted change like making cache=none default for physical
>>>> devices would satisfy mostly everyone.
>>> Is there any other thing than physical devices attached to the -drive
>>> parameter?
>> Image files which are the overwhelming more common use-case.
> For image files we certainly want it too, at least for proper ones (ie.
> raw). It could be that it causes problems for qcow2.

Qcow2 is safest with cache=writethrough because it doesn't order image updates:



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