Hi Han,<div dir="auto"><br></div><div dir="auto">Can you give us some more information?</div><div dir="auto">Where is the delay? Is it in volume building, allocation selection? Spawning? Etc.</div><div dir="auto"><br></div><div dir="auto">The VM instantiation process has a number of us processes that can all slow down at scale for different reasons.</div><div dir="auto"><br></div><div dir="auto">I doubt it is the actual spawning or allocation stage, likely a ceph/cinder building stage, especially if it’s copying data via glance to a volume.</div><div dir="auto"><br></div><div dir="auto">Thanks,</div><div dir="auto">Karl.</div>