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Re: [Qemu-block] [Qemu-devel] [PATCH 0/2] Add reduce image for qcow2

From: Richard W.M. Jones
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 0/2] Add reduce image for qcow2
Date: Wed, 31 May 2017 17:10:26 +0100
User-agent: Mutt/1.5.20 (2009-12-10)

On Wed, May 31, 2017 at 06:54:33PM +0300, Pavel Butsykin wrote:
> It is assumed that the user has already made a preparatory with the
> image:
> 1. freeing space at the end of the image
> 2. reducing the last partition on the disk
> 3. rebuilding fs
> Only after these steps, the user can reduce the image by qemu-img.

It's tricky with GPT, as GPT puts a second copy of the header in the
last few sectors of the disk.  I always advise people to use trim (or
virt-sparsify) instead of trying to adjust virtual disk size.

Nevertheless I don't think we should prevent shrinking qcow2 virtual
size.  It's likely useful to someone.


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
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