| 摘要 |
<p>Disclosed is a storage system provided with a memory medium and a virtual machine monitor. The virtual machine monitor creates a virtual machine which writes data to or reads data from the memory medium in response to commands from a host computer. Cache memory is allocated to the virtual machine, said cache memory being used to store cache data connected to the logical address of the region of the memory medium in which the written or read data is stored. The virtual machine monitor starts up an old storage program and creates an old storage execution unit, containing the old storage program, as a virtual machine. When the old storage program is updated to a new storage program, the virtual machine monitor starts up the new storage program and creates a new storage execution unit, containing the new storage program, as a virtual machine. The old storage execution unit and the new storage execution unit exist concomitantly.</p> |
