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System and method to honor Service Level Agreements of applications on a Virtual Real Memory enabled Virtual Machine
English (United States)
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System and method to honor Service Level Agreements of applications on a Virtual Real Memory enabled Virtual Machine (LPAR)
Virtual Real Memory feature that allows a hypervisor to actively support multiple active virtual machines, in a way that the memory those virtual machines is using can exceed the memory available to the hypervisor. Essentially, each virtual machine is presented with an amount of memory that it assumes it can use. However, the hypervisor manages the memory in a way that can move physical memory from one partition to another, possibly using secondary storage such as disk.
When the consumed memory exceeds the physical memory of the system, due to contention over the memory that is shared between virtual machines, the rationing of the memory is performed by the hypervisor. Each virtual machine may have a weight, and the hypervisor determines physical memory assignment priority based on these weights. The problem exists in that the hypervisor is operating at a virtual machine level of granularity. The applications running within the virtual machine automatically inherit the settings applied for that virtual machine, even when there are multiple applications running within a virtual machine. Running applications can't maintain a quality of service guarantee; If there are multiple applications running, one or few of them require service level agreement, with the current method there is no way to give higher...