From: Thomas Mueller <thomas@chaschperli.ch>
To: kvm@vger.kernel.org
Cc: qemu-devel@nongnu.org
Subject: Re: [PATCH][RFC] Use writeback caching by default with qcow2
Date: Thu, 20 Nov 2008 16:23:19 +0000 (UTC) [thread overview]
Message-ID: <gg42tn$mfc$2@ger.gmane.org> (raw)
In-Reply-To: alpine.LNX.2.00.0811200744540.3029@x9.ybpnyarg
>>
>> > or contrawise: on the other formats the metadata is updated in the
>> > correct order?
>> >
>> >
>> raw is the only format we're sure of.
>
> With that in mind I converted my qcow2 image to raw, and I'm trying to
> use that as a base image to create a new raw (writeable) image:
>
> #qemu-img create -b vista.raw vista.delta Formatting 'vista.delta',
> fmt=raw, backing_file=vista.raw, size=20971520 kB qemu-img: Formatting
> or formatting option not supported for file format 'raw'
>
> Doesn't that seem like a bug? Do people just not use raw images in this
> way?
you can only use a backing file with qcow2 IMHO. also snapshots (savevm/
loadvm) work only with qcow2.
- Thomas
prev parent reply other threads:[~2008-11-20 16:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-19 20:24 [PATCH][RFC] Use writeback caching by default with qcow2 Anthony Liguori
2008-11-19 22:27 ` Stefan Berger
2008-11-20 7:04 ` Thomas Mueller
2008-11-20 9:55 ` Avi Kivity
2008-11-20 15:53 ` walt
2008-11-20 16:23 ` Thomas Mueller [this message]
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