Strahil Nikolov

On Wed, Jul 13, 2022 at 3:10, Pascal D
<pascal@butterflyit.com> wrote:

I have experienced the same performance problem in creating new template or creating new stateful image from template. I have traced it to the use of qemu-img convert which is very very slow.

Currently a template creation on my setup, takes around 29m for a 45G image when a simple copy over NFS takes 1m26s over a 10G network which is expected since there is roughly as many read as write over the network (4Gbps)

Adding --cache writeback to qemu-img improves from 29m to around 8m but according to a prior comment on this mailing list might not work on all platform.

Hope that helps

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