On 11.03.2014 16:46, Marcus wrote:
so it looks like preallocation only works 1) on raw volumes, and 2) on
certain libvirt versions. I'll see if I can add those checks in,
assuming we really want to keep that flag.

That is true. Preallocation seems only for raw types.
This is what I see with libvirt 1.1.1 on RHEL 7 (beta):

[root@1708 ~]# virsh vol-resize test.qcow2 6M --allocate --pool default
error: Failed to change size of volume 'test.qcow2' to 6M

error: Operation not supported: preallocate is only supported for raw type volume

HTH

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