Hitachi, Ltd.

Takao Totsuka

Norimitsu Hayakawa

Yukari Hatta

Kouji Iwamitsu

Shinri Inoue

Hiroshi Miki

Toshiomi Moriki

Takashi Shimojo

Kazuaki Okada

Akira Takeshita

Masatoshi Konagaya

Shiro Nohara

Satoshi Kinugawa

Harumi Oigawa

A storage system includes a plurality of storage nodeseach having one or more storage devices. The storage node includes a CPU. The CPU is configured to select a priority path to be notified as a usable path to a higher-level apparatus among paths which allows access of a predetermined logical unit to which a storage area of the storage device is provided from the higher-level apparatus. The CPU is configured to send the priority path as a reply to an inquiry about a path to the predetermined logical unit from the higher-level apparatus.

Storage system, path management method, and recording medium

A computer on which OSs run is coupled to the storage apparatus, the OSs include a first OS controlling access to the storage apparatus and a second OS generating a virtual computer. A logically divided computer resources are allocated to the first OS and the second OS respectively. A third OS for executing an application runs on the virtual computer. The second OS has a shared region management part managing a shared region that is a memory region used for communication between the application and the first OS. The third operating system has an agent requesting the second operating system to secure the shared region based on a request from the application and mapping the secured shared region to a guest virtual address space.

Computer and memory region management method

A computer, on which operating systems run, the computer comprising a virtualization function module configured to manage virtual computers. A operating system is configured to run on each of the virtual computers. The virtualization function module includes an interrupt controller. The interrupt controller is configured to hold vector information for managing host-side interrupt vectors, and interrupt vector allocation information for managing allocation of the host-side interrupt vectors to the guest-side interrupt vectors that are set by the operating systems. The virtualization function module is configured to analyze a state of allocation of the host-side interrupt vectors to the guest-side interrupt vectors, and change the allocation of the host-side interrupt vectors to the guest-side interrupt vectors based on a result of the analysis.

Computer and method with interrupt vector management

A computer, on which a plurality of operating systems run, wherein the plurality of operating systems includes a first operating system and a second operating system configured to generate a plurality of virtual computers. The first operating system runs on a first logical resource, and the second operating system runs on a second logical resource. A third operating system runs on each of the plurality of virtual computers. The third operating system secures a cache memory area in a virtual memory. The second operating system generates location information, which indicates a location of the cache memory area in a physical address space that the second operating system manages. The first operating system obtain data stored in the cache memory area based on the location information.

Nonvolatile storage of host and guest cache data in response to power interruption

The network connection of a VM (target VM) that has been live-migrated from a first physical computer to a second physical computer is restored in a virtual computer system in which communication is performed using a certain type of information outside the jurisdiction of a virtualization mechanism. When receiving a packet from the VM, the first virtualization mechanism of the first physical computer extracts a certain type of information from the packet and registers the extracted certain type of information in a first management information unit. The first virtualization mechanism transmits the certain type of information in the first management information unit to the second virtualization mechanism of the second physical computer during live migration. The second virtualization mechanism registers the certain type of information in a second management information unit and transmits a certain type of packet including the certain type of information from at least one of one or more physical I/O devices of the second physical computer in order to restore the network connection of the target VM.

Virtual computer system for restoring network connection of live-migrated virtual computer

A computer system including no basic input/output system (BIOS) for operating bootstrap used in initial activation of a legacy operation system is allowed to perform booting of legacy operation system therefor and includes a central processing unit (CPU) and a memory, in which extended firmware and bootstrap program are stored. The extended firmware includes BIOS emulator and a plurality of device drivers. The extended firmware uses the device driver to make the BIOS emulator perform emulation of BIOS operation in response to a BIOS call issued by the bootstrap program.

System connected to a memory for storing an extended firmware having a bios emulator in which the bios emulator is overwritten using a interruption vector for handling a bios call

A hypervisor sets all physical areas in an allocation area, which is allocated to a virtual machine from within a physical memory and is configured from a plurality of physical areas, to a write protect mode. In a case where a physical processor identifies that the write-destination area from the virtual machine is in the write protect mode, the hypervisor manages the write-destination area as an updated area, and cancels the write protect mode of the write-destination area. At a certain point in time, the hypervisor copies data inside the updated physical area from within the allocation area to a storage area (a copy area) that differs from the allocation area. In a case where a prescribed failure is detected in the physical area, the hypervisor restores data from the copy area.

Growing community of inventors

Tokyo, Japan

Takao Totsuka