1. A method comprising: displaying a resource allocation matrix, the resource allocation matrix including a plurality of cells, each of the plurality of cells indicating a quantity of one of a plurality of resources on one of a plurality of physical systems allocated to one of a plurality of virtual systems hosted by the one physical system; receiving an input changing the quantity indicated in a cell, the cell indicating the quantity of a resource on a physical system allocated to a virtual system hosted by the physical system; and adjusting the quantity of the resource allocated to the virtual system based on the input, wherein the quantity of the resource allocated is adjusted by adjusting a percentage of the resource allocated to the virtual system relative to an amount of the resource available for allocation, wherein the input received is movement of a slider displayed in the cell.