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Re: [Qemu-devel] delvm does not reduce the qcow2 file size
From: |
Kuniyasu Suzaki |
Subject: |
Re: [Qemu-devel] delvm does not reduce the qcow2 file size |
Date: |
Tue, 16 Oct 2012 15:23:49 +0900 (JST) |
Hello,
From: Paolo Bonzini <address@hidden>
Subject: Re: delvm does not reduce the qcow2 file size
Date: Mon, 15 Oct 2012 15:25:16 +0200
> Il 15/10/2012 11:33, Kuniyasu Suzaki ha scritto:
> > Hello,
> >
> > "delvm" is a command to delete a snapshot image in a qcow2 file.
> > However it does not reduce the qcow2 file size.
>
> Note that the file will not grow when new allocations are performed in
> the future.
You mean that the qcow2 file size will not increase when "savevm"
commnad is issued after "delvm".
Namely, the qcow2 file size is almost same when I take a snapshot
after delete previous snapshot image.
> QEMU should also convert the unused clusters to "holes" in the file
> system, but it doesn't do that yet.
I hope a qcow2 file is reduced automatically when a snapshot is deleted.
> > Is there any method to reduce the qcow2 file size when I delete a snapshot
> > image?
> > should I "convert" the qcow2 file?
>
> I'm not sure what convert does if you have internal snapshots.
>
> Paolo
------
suzaki