Method and controller device for quality of service (qos) caching in a virtualized environment

A storage controller device, comprising:

• an interface configured to couple the storage controller device to at least one data storage device;
• and
• a processor coupled to the interface and configured to read data from and write data to the at least one data storage device,
• wherein the storage controller device includes a controller that hosts a virtualized environment having a plurality of virtual machines,
• wherein the storage controller device is configured to
• assign a portion of the computing resources to the plurality of virtual machines, and
• lease by a first virtual machine at least a portion of the assigned computing resources of at least one second virtual machine,
• wherein the first virtual machine leases computing resources from the at least one second virtual machine when the first virtual machine needs additional computing resources and at least a portion of the assigned computing resources of the at least one second virtual machine are not being used by the at least one second virtual machine.

A non-transitory computer readable medium storing instructions that carry out a method for sharing computing resources in a virtualized environment having a plurality of virtual machines, the method comprising:

• instructions for assigning a portion of the computing resources to the plurality of virtual machines;
• and
• instructions for leasing by a first virtual machine at least a portion of the assigned computing resources of at least one second virtual machine,
• wherein the first virtual machine leases computing resources from the at least one second virtual machine when the first virtual machine needs additional computing resources and at least a portion of the assigned computing resources of the at least one second virtual machine are not being used by the at least one second virtual machine.