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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




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