Elaborate on IO delay in server summary

I'm curious about the actual meaning of the IO delay in the Server's Summary. For example, when I clone a VM from a template, I expect high IO. All my clone templates are on it's own dedicated drive. When I clone a VM from one of these templates, the IO delay for the node hops up as high as 30-35%, but VMs on that same node but on a different disk seem relatively unaffected. Even the nodes performance in general seems about normal, which is odd because if a high IO delay is, say, on the...

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