[ale] QCOW2 Performance?

[DJPfulio at jdpfu.com (DJ-Pfulio)]

QCOW2 Performance?

Does anyone have incite into the performance of qcow2 for kvm VMs on spinning
HDDs?

How much slower will they be than raw images is really my question.

I did some testing between vdmk, vdi and images on virtualbox a few years ago -
raw images were much faster.  Then last year, I tested VDI sparse, VDI
pre-allocated and QCOW to find that VDI had improved greatly and was within
5-10% of raw image performance. QCOW was 4x slower. Used the same spinning HDD,
no SSDs for the tests.

So, is qcow2 performance even close to raw images for spinning disks?

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