Checking that in Disco confirms the same behavior:
[Di, 08 Okt 2019 07:19:27 virt-manager 12667] DEBUG (storage:719) Creating
storage volume 'ubuntu19.04.qcow2' with xml:
<volume>
<name>ubuntu19.04.qcow2</name>
<capacity>16106127360</capacity>
<allocation>16106127360</allocation>
<target>
<format type="qcow2"/>
<features>
<lazy_refcounts/>
</features>
</target>
</volume>
Into:
/usr/bin/qemu-img create -f qcow2 -o
preallocation=falloc,compat=1.1,lazy_refcounts
/var/lib/libvirt/images/ubuntu19.04.qcow2 15728640K
So this might be - after all - the libvirt change in >=Cosmic?
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https://bugs.launchpad.net/bugs/1847105
Title:
very slow disk creation, snapshotting
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