The effectiveness of deduplication on virtual machine disk images

Virtualization is becoming widely deployed in servers to efficiently provide many logically separate execution environments while reducing the need for physical servers. While this approach saves physical CPU resources, it still consumes large amounts of storage because each virtual machine (VM) instance requires its own multi-gigabyte disk image. Moreover, existing systems do not support ad hoc block sharing between disk images, instead relying on techniques such as overlays to build multiple VMs from a single “base” image. Instead, we propose the use of deduplication to both reduce the total storage required for VM disk images and increase the ability of VMs to share disk blocks. To test the effectiveness of deduplication, we conducted extensive evaluations on different sets of virtual machine disk images with different chunking strategies. Our experiments found that the amount of stored data grows very slowly after the first few virtual disk images if only the locale or so...

• Type: Conference
• Year: 2009
• Where: SYSTOR
• Authors: Keren Jin, Ethan L. Miller
• Keywords: Control Systems, Disk Images, Machine Disk Images, SYSTOR 2009, Virtual Machine Disk