Interesting - at first the only related change seems to be in libvirt.
Function storageBackendCreateQemuImgOpts of src/storage/storage_util.c.
It is in there since [1] which on itself makes sense to me.
Also that particular change is in libvirt since v4.3 which means >=Cosmic and
we haven't had major bugs in those releases nor in e.g. cloud archive backports
of the same due to it.
Looking forther points in virt-manager to [2] but that is from 2013, but
looking at recent related code shows [3] which is only in since v2.2.0
and that would match.
That is in /usr/share/virt-manager/virtinst/storage.py of binary
"virtinst" of src:virt-manager.
>From debug we see the config virt-manager defines for that disk:
virt-manager 8272] DEBUG (storage:643) Creating storage volume with xml:
<volume>
<name>ubuntu19.04.qcow2</name>
<capacity>16106127360</capacity>
<allocation>16106127360</allocation>
<target>
<format type="qcow2"/>
<features>
<lazy_refcounts/>
</features>
</target>
</volume>
Which matches what libvirt receives:
debug : virStorageVolCreateXML:1499 : pool=0x2867ae0, xmlDesc=<volume>
<name>ubuntu19.04.qcow2</name>
<capacity>16106127360</capacity>
<allocation>16106127360</allocation>
<target>
<format type="qcow2"/>
<features>
<lazy_refcounts/>
</features>
</target>
</volume>
, flags=0x1
[1]:
https://libvirt.org/git/?p=libvirt.git;a=commit;h=c9ec7088c7a3f4cd26bb471f1f243931fff6f4f9
[2]:
https://github.com/virt-manager/virt-manager/commit/37350859ce6c46a1c7e6562db8e242a97bcf5bb3
[3]:
https://github.com/virt-manager/virt-manager/commit/4f66c423f7833e270b61536d53a0772ce1242abc
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https://bugs.launchpad.net/bugs/1847105
Title:
very slow disk creation, snapshotting
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