1. A method, comprising: at one or more data management computers: obtaining, from a virtual system manager that manages one or more virtual machines, both (a) particular virtual machine data that relates to a particular virtual machine, and (b) an indication that the particular virtual machine uses a particular volume of data storage that contains data of the particular virtual machine and is managed by a storage controller that manages one or more storage units and that is separate from the virtual system manager; obtaining, from the storage controller, both (a) particular storage data that relates to the particular volume, and (b) an indication that the particular storage data relates to the particular volume; correlating the particular storage data to the particular virtual machine data based on both the indication that the particular virtual machine uses the particular volume and the indication that the particular storage data relates to the particular volume; determining performance information related to the particular volume that is based at least in part on an outcome of the correlating, the performance information including an indication that the particular volume that contains data of the particular virtual machine is a cause of a performance issue of the particular virtual machine based on information indicating a latency associated with the particular volume or a rate associated with the storage controller; and reconfiguring the particular virtual machine to use a volume of data storage other than the particular volume that is the cause of the performance issue of the particular virtual machine.