Storage Policy-Based Management (SPBM) is a feature of VMware vSphere that allows administrators to create storage profiles so that virtual machines (VMs) don't need to be individually provisioned and so that management can be automated.
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Administrators can create policies that contain storage requirements such as performance and availability, which can then be assigned to VMs. Those policies then automatically dictate where VMs are stored so that the requirements are met. Capabilities that administrators are able to define in policies include the maximum number of failures a VM object can tolerate, the number of disk stripes per object, the amount of capacity that should be reserved during VM creation, amount of solid-state drive capacity to be reserved as cache, and whether to provision VMs in the event the specified policy cannot be met by the datastore.