Patent ID: 8813076

Claim:
A system comprising: a number of virtual machines, each virtual machine including an operating system, the operating system portioned into a plurality of logical file blocks; and a server system comprising: memory storing the operating system and a change to a portion of the operating system; a virtualization engine operable to provide an interface between the virtual machines and the server system, wherein the virtualization engine maps logical disk blocks of the virtual machines to the logical file blocks, and wherein the logical disk blocks comprise a padded portion as needed to map to a whole number of respective logical file blocks; and a processing system operable, according to the virtualization engine, to update the portion of the operating system for one of the virtual machines when the virtual machine is modifiable, wherein the portion of the operating system being updated comprises one or more new logical file blocks, and wherein updating the operating system with the new logical file block for the one virtual machine comprises replacing one or more old logical disk blocks with one or more new logical disk blocks, the new logical disk blocks comprising a padded portion to map to a whole number of the new logical file blocks.