SYSTEM FOR VIRTUAL DISKS VERSION CONTROL

摘要

A system (10) for virtual disks version control includes a selectively read- only volume (12); at least one topmost overlay (141, 142, 143, 144, 145); and at least two intermediate, selectively read-only overlays (16, 16', 16", 16'") configured as at least two mounting points. The at least one topmost overlay (141, 142, 143, 144, 145) is configured to store the results of redirected write operations. One of the at least two mounting points (16, 16', 16", 16'") and the volume (12) form an image, and the other of the at least two mounting points (16, 16', 16", 16'") and the volume (12) form another image. The at least two intermediate overlays (16, 16', 16", 16'") are operatively located between the volume (12) and the at least one topmost overlay (141, 142, 143, 144, 145). Each of the at least two mounting points (16, 16', 16", 16'") is configured to enable a plurality of client computers (18) to concurrently read the image or the other image and to concurrently write to a respective one of the at least one topmost overlays (141, 142, 143, 144, 145).