MultiCache: Multilayered Cache Implementation for I/O Virtualization

Table 1

Difference between two MultiCache components.

	Guest-level component	Hypervisor-level component
Objective	To minimize the overhead between the shared storage and the guest VM	To minimize the overhead between the guest VM and the host
I/O unit	File	Sector
Optimization hint	File usage count	Sector I/O access frequency
Cache memory	Placed in the guest VM	Placed in the hypervisor
OS dependency	Yes	No