ESXi

PDL vs APD: The Storage Failure Model Every vSphere Operator Needs

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Storage failures in vSphere are rarely just “storage is down.” That phrase may be accurate from the application owner’s point of view, but it is not precise enough for the operator who has to decide what happens next. A host that has lost all paths to a datastore behaves differently from a host that has … Read more

Why Large VM vMotion and Clone Tasks Fail: Device Limits, Config Hygiene, and PowerCLI Prechecks

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Large VM migrations usually fail at the worst possible time: late in the change window, after the task has already consumed hours of storage, network, and operator attention. When the error is something like “Invalid configuration for device ‘##’,” the first instinct is to look for a broken virtual NIC, a missing port group, an … Read more