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Resizing an OSX VM with apfs and QEMU

Looking to resize an existing qcow2 or raw data volume with QEMU?

I had to do the same thing and went through some trouble in trying to do this. My first idea was to use GParted and boot from the live-cd iso to extend the apfs partition. However, it turns out that GParted does not support apfs (yet?).

First, you’ll need to expand the disk space available to the VM. Depending on the disk format, you can use:

  • qcow2: qemu-img resize image.qcow2 +20G
  • lvm: lvextend -L /dev/lvmpool/vm +20G

Now you can expand the apfs container from inside the OSX VM. Simply find out the identifier of your partition:

/usr/sbin/diskutil info / | awk '/Part of Whole/ {print $4}'

And use that identifier together with this command:

/usr/sbin/diskutil apfs resizeContainer /dev/{identifier} 0

This will expand to use up all available free disk space.

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By Jochen Delabie

Working on a SaaS called TestingBot.com

One reply on “Resizing an OSX VM with apfs and QEMU”

I had to do a `disktutil repairdisk disk1` first, otherwise it wasn’t taking advantage of the extra capacity.

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