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Re: [Qemu-block] Persistent bitmaps for non-qcow2 formats
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-block] Persistent bitmaps for non-qcow2 formats |
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Date: |
Wed, 6 Sep 2017 14:11:20 +0100 |
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User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Tue, Sep 05, 2017 at 01:46:24PM +0200, Kevin Wolf wrote:
> Am 22.08.2017 um 21:07 hat John Snow geschrieben:
> > Well, we knew we'd want this sooner or later. I've got some pings
> > downstream over whether or not we support persistent bitmaps for
> > non-qcow2 formats.
> >
> > Currently: no, we don't.
>
> I was going to write some things about r/w backing file, and I might
> still do that later, but for now, let me take a step back:
>
> What is the use case here?
A user has 100s or 1000s of disk images over iSCSI. They would like to
use the new incremental backup feature. Converting all existing disk
images to qcow2 is not an option because it would be too invasive.
Stefan