Re: [Qemu-discuss] qcow2 performance improve

[Alberto Garcia]

On Wed 15 Aug 2018 05:47:57 PM CEST, Jakob Bohm wrote:
> And don't forget the high-speed solution: Create the qcow2 file with
> all clusters preallocated in contiguous file clusters in a
> non-fragmented file on the underlying physical disk(s).
>
> I believe there are qemu-img options to create such qcow2 files

Indeed:

qemu-img create -f qcow2 -o preallocation=falloc ...
qemu-img create -f qcow2 -o preallocation=full   ...

Berto