From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Neobiker <neo-ml-efw-1106@neobiker.de>
Cc: xen-devel@lists.xensource.com,
Daniel Stodden <daniel.stodden@citrix.com>
Subject: Re: Which disk backend to use in domU?
Date: Mon, 14 Jun 2010 11:49:45 +0100 [thread overview]
Message-ID: <4C160949.7050007@goop.org> (raw)
In-Reply-To: <28858517.post@talk.nabble.com>
On 06/11/2010 07:11 PM, Neobiker wrote:
> Hi
>
> Valtteri Kiviniemi-2 wrote:
>
>> Hi, Ah, misunderstanding sorry, you were talking about disk images :)
>>
>>
> I'm talking about this config:
> disk = [
> 'phy:/dev/vm/vm01,xvda1,w',
> 'phy:/dev/vm/vm01-swap,xvda2,w',
> 'phy:/dev/daten/devel_debian_amd64,xvda3,w',
> ]
>
file: is definitely unsafe; its IO gets buffered in the dom0 pagecache,
which means the guests writes aren't really writes. I believe phy: has
similar problems, whereas tap:aio: implemented direct IO. But someone
more storagey can confirm.
J
next prev parent reply other threads:[~2010-06-14 10:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 21:02 Xen pv_ops dom0 2.6.32.13 issues greno
2010-06-09 22:37 ` Jeremy Fitzhardinge
2010-06-09 23:27 ` greno
2010-06-09 23:37 ` Jeremy Fitzhardinge
2010-06-11 17:06 ` Which disk backend to use in domU? Neobiker
2010-06-11 17:42 ` Valtteri Kiviniemi
2010-06-11 17:53 ` Valtteri Kiviniemi
2010-06-11 18:11 ` Neobiker
2010-06-14 10:49 ` Jeremy Fitzhardinge [this message]
2010-06-14 10:57 ` Daniel Stodden
2010-06-14 11:01 ` Pasi Kärkkäinen
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