[SOLVED] Doesn't full preallocate work for qcow2?

[cosmos]

I tried to create a fully (ie, not only for the metadata) preallocated qcow2 image file, with the following command, but I am receiving errors:

# qemu-img create -f qcow2 -o preallocation=full vm-100-disk-3.qcow2 128G
Formatting 'vm-100-disk-3.qcow2', fmt=qcow2 size=137438953472 encryption=off cluster_size=65536 preallocation='full' lazy_refcounts=off
Invalid preallocation mode: 'full'
qemu-img: vm-100-disk-3.qcow2: error while creating qcow2: Invalid argument

Why isn't full preallocation understood?

 

[mmenaz]

$ man qemu-img says:
"preallocation" Preallocation mode (allowed values: off, metadata). An image with preallocated metadata is initially larger but can improve performance when the image needs to grow.
so seems you only have "off" or "metadata", not "full".

 

[cosmos]

I read this piece of documentation: http://linux.die.net/man/1/qemu-img

Must be some different port of qemu-img then...