| 摘要 |
The present invention relates to a technique of updating a snapshot image. A method for updating a snapshot image according to the present invention comprises: a dirty page recording unit for storing an updated memory area in a dirty page list as a dirty page; a new mapping table writing unit for copying the dirty page stored in the dirty page list in a storage device when an operation of updating a snapshot begins, and generating a new version mapping table derived by copying a mapping table included in an existing snapshot image to record a location in the storage device in which the dirty page is recorded; and a mapping table address update unit for updating a mapping table address of the existing snapshot image to an address of the new version mapping table when there is no more dirty page to copy in the storage device in the dirty page list. |
