Distributed virtual machine image management for cloud computing

Patent metadata

Field	Value
Publication number	US-9218194-B2
Application number	US-201313943773-A
Country	US
Kind code	B2
Filing date	Jul 16, 2013
Priority date	Jul 12, 2013
Publication date	Dec 22, 2015
Grant date	Dec 22, 2015

Abstract

Embodiments of the present invention and provide a method for distributed virtual machine (VM) image management in a cloud computing management includes receiving in a hypervisor executing in memory of a host computer, a request for VM image data from a VM and determining whether or not the requested VM image data is present in a local cache of either the hypervisor of the host computer or in a cache of a hypervisor of a peer host. The method additionally includes retrieving the requested VM image data from a seed image in a remote data store in the cloud computing environment only when it is determined that the VM image data neither is present in the local cache of the hypervisor of the host computer nor is present in the cache of the hypervisor of the peer host.

First claim

We claim:

1. A method of distributed virtual machine (VM) image management in a cloud computing environment, the method comprising:
receiving in a hypervisor executing in memory of a host computer, a request for VM image data for a portion of a VM image;
determining whether or not the requested VM image data is present in either a local cache of the hypervisor of the host computer or in a cache of a hypervisor of a peer host;
retrieving the requested VM image data from a VM image seed in a remote data store in the cloud computing environment only when it is determined that the VM image data neither is present in the local cache of the hypervisor of the host computer nor is present in the cache of the hypervisor of the peer host; and,
caching in the local cache of the hypervisor of the host computer the VM image data retrieved from the cache of the hypervisor of the peer host in response to a determination that the VM image data had been previously retrieved from the cache of the hypervisor of the peer host a threshold number of times.

2. The method of claim 1 , further comprising:
retrieving the VM image data from the cache of the hypervisor of the peer host only when it is determined that the VM image data is not present in the local cache of the hypervisor of the host computer, but is present in the cache of the hypervisor of the peer host.

3. The method of claim 1 , wherein it is determined whether or not the requested VM image data is present in the cache of the hypervisor of the peer host by reference to a descriptor of content of the cache of the hypervisor of the peer host published by the hypervisor of the peer host.

4. The method of claim 1 , further comprising:
caching in the local cache the VM image data retrieved from the VM image seed; and,
updating a descriptor of content of the local cache to indicate the caching of the VM image data in the local cache.

5. The method of claim 1 , further comprising:
determining whether or not the requested VM image data is present in copy on write (COW) data store of the hypervisor of the host computer; and,
retrieving the requested VM image data from the VM image seed in the remote data store in the cloud computing environment only when it is determined that the VM image data neither is present in the local cache of the hypervisor of the host computer nor is present in the cache of the hypervisor of the peer host nor is present in the COW data store.

Assignees

• IBM

Inventors

• Brant Charles D
• Choudhary Samar
• Garrison Michael John
• Mckay Michael

Classifications

• G06F9/45533 Primary

  Hypervisors; Virtual machine monitors · CPC title

• G06F12/0888

  using selective caching, e.g. bypass · CPC title

• G06F9/45558 Primary

  Hypervisor-specific management and integration aspects · CPC title

• H04L67/568

  Storing data temporarily at an intermediate stage, e.g. caching · CPC title

• G06F2009/45595

  Network integration; Enabling network access in virtual machine instances · CPC title