Hmm it doesn't ring a bell to me. I would suggest to open a ticket in parallel so someone could take a look on next week 
XCP-ng Team
Developers of XCP-ng
Posts
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RE: SR stats show “No stats” in Xen Orchestra after latest XCP-ng 8.3 patches
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RE: SR stats show “No stats” in Xen Orchestra after latest XCP-ng 8.3 patches
Hi,
Are you using QCOW2?
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RE: "NOT_SUPPORTED_DURING_UPGRADE()" error after yesterday's update
Exactly and that's what does the Rolling Pool Update feature
