1. A method for use in mapping data storage and virtual machines, the method comprising: providing, from a physical data storage system having a plurality of disk drives, a logical volume configured for use by a hypervisor; querying, from the physical data storage system, the hypervisor, through a web service, to identify a virtual machine of the hypervisor, wherein credentials are entered for accessing the hypervisor, and wherein the credentials are stored in persistent storage associated with the physical data storage system using a lockbox mechanism; polling, the virtual machine for storage usage information, wherein polling includes using the credentials to access the virtual machine from the physical data storage system; determining, at the physical data storage system, that the virtual machine is using the logical volume; and identifying, at the physical data storage system, a set of physical disk drives associated with the logical volume being used by the virtual machine.