Hitachi, Ltd.

Hitachi Koki Co., Ltd.

Isao Watanabe

Satoshi Aita

Shuho Yokokawa

Hiroshi Ueno

Kunitomo Takahashi

Hidenori Takayasu

Isao Nakajima

Yasuyuki Tsuji

Tsukasa Onose

Youji Hirose

Shuuho Yokokawa

Toru Kikuchi

Yoshio Ogura

Yoshiko Tamaki

Shuhei Matsumoto

Koji Doi

Makiko Shinohara

Muneyoshi Akai

Hidenori Iwanaga

Youichi Takeuchi

Kaoru Suzuki

Katsumi Ishizawa

Koutarou Yamada

Shigeo Nemoto

Hiroyuki Mitome

Katuhiro Shinohara

Kouhei Katayama

Syou Sawahata

Takehiro Honda

Osamu Ohuchi

Hiroshi Udo

Atsushi Kawai

Taisei Yoshino

Minoru Murase

Akiko Mori

Kazuo Takano

In a storage system provided with a plurality of storage modules, the rated power consumption can be reduced. The storage system is provided with a charge control unit. The charge control unit stops, when detecting that a predetermined number of a plurality of battery modules are during battery charging, the battery charging in the remaining battery modules.

Computer system, device sharing method, and device sharing program

The disclosed is a computer system enabling a plurality of LPARs on a plurality of physical computers to share an SR-IOV device that requires an interface between a PF and a VF. In an environment where a PCI SR-IOV device is allocated to virtual machine monitors on a plurality of physical computers through an I/O switch, a PF is allocated to a first virtual machine monitor and a plurality of VFs is allocated to an LPAR on an optional virtual machine monitor. When a second virtual machine monitor detects an event that is generated from a VF to the PF, the second virtual machine monitor communicates the detected event to the first virtual machine monitor to which the PF is allocated, and allows the first virtual machine monitor to execute the PF event. Further, when the first virtual machine monitor detects an event that is generated from the PF to a VF, the first virtual machine monitor communicates the detected event to the second virtual machine monitor to which a target VF is allocated, and allows an LPAR on the second virtual machine monitor to execute the VF event.

A virtual machine control method and a virtual machine system are disclosed. In the case where a guest program can be operated in a plurality of address translation modes and the same guest virtual address is translated into different host real addresses in each address translation mode, the illegal access to a host real address by illegal address translation by double registration in the same page table is avoided, and the address translation mechanism is efficiently operated. A plurality of host page tables are prepared in the main storage, and one of the host page tables is selected with the change in address translation mode of the guest program. The bottom address of the selected host page table is set in the host page table register thereby to switch the host page table.

Virtual machine control method and virtual machine system having host page table address register

In verifying a logic operation of an information processing apparatus, an I/O emulator and a test program are operated in cooperation with each other and input data to the I/O emulator is automatically generated to generate more transaction conflict patterns and realize verification of the logic operation at a high precision.

Transaction conflict testing method and apparatus

A high-speed performance simulation method and system for simulating the performance of a large-scaled system such as a parallel computer. In implementation, the large-scaled system is divided into subsystems or partial units and the divided subsystems are simulated in parallel. Even when a particular partial unit occupies a shared resource, high-speed, well-coordinated performance simulation is achieved. A performance simulation system includes a plurality of performance simulators and an overall control section connected to these performance simulators. The plurality of performance simulators individually simulate the performances of partial units into which a simulant is divided. The overall control section causes the performance simulators to conduct the simulation processes alternately every AT cycle. When having finished a performance simulation process for a AT cycle, the first performance simulator transmits to the second performance simulator shared resource data stored in a shared resource management section, the shared resource occupation status data indicating that the shared resource is occupied. Then, the second performance simulator conducts a performance simulation process for a AT cycle and transmits shared resource occupation status data to the first performance simulator. The performance simulators responsible for subsystems that have no shared resource conduct simulation processes concurrently to increase the whole simulation speed.

Method and system for simulating performance of a computer system

A a fixing apparatus for an electrophotographic apparatus includes a heat roller (11a) having a heater (14) therein and a pressure roller (11b) urged against the heat roller, wherein a recording material (6) holding a toner image (25) thereon is sandwiched and carried while being heated and pressurized at a pressing portion between the heat roller and the pressure roller thereby to fix the toner image on a surface of the recording material, the fixing apparatus further including a first temperature detecting mechanism (18) formed by a temperature detecting element (15) provided at a portion of an outer periphery of the heat roller and a sensor head (17) disposed so as to be able oppose to the temperature detecting element, a second temperature detecting mechanism (19) formed by a plurality of temperature detecting elements disposed at a constant interval therebetween along an axial direction of the heat roller and spaced from the outer periphery of the heat roller, and a control mechanism (20, 21, 22, 23, 24) for controlling turning-on and turning-off of the heater in accordance with either one of outputs from the first and second temperature detecting mechanism.

Fixing apparatus and method for electrophotographic apparatus including

In order to provide an indication when it is necessary to exchange toner recovery container, an electrophotographic apparatus monitors the accumulated driving time of a toner supply drive unit, and a massage indicating 'exchange the toner recovery container' is displayed at the time when a toner supply switch is operated under state in which the accumulated driving time exceeds a preset value.

Method and apparatus for indicating time for exchanging toner recovery

A toner supply control system of the electrophotographic apparatus which includes a developing unit 3 for developing with a developer composed of toner and carrier; a toner hopper 4 for storing the toner; a toner empty sensor 7 for detecting the remainder of toner in the toner hopper 4; and a toner supply drive unit 5 for conveying toner from the outside of the apparatus into the toner hopper 4. Toner is conveyed from the outside into the toner hopper 4 by driving the toner supply drive unit 5 over a predetermined period of time without stopping the operation of the electrophotographic apparatus when the toner empty sensor 7 detects over a predetermined period of time that the remainder of toner in the toner hopper 4 is small. Then the existence of an output signal outputted from the toner empty sensor 7 indicating that the remainder of toner is small is detected, and a previous signal of toner shortage is output while the developing operation of the electrophotographic apparatus is being maintained in the case of existence of the output signal, and the shortage of toner is reported to an operator in accordance with the previous signal of toner shortage.

Toner supply control system for an electrophotographic apparatus

When a developing agent prepared to have a preset toner density is loaded in a developing unit, a comparing reference level for controlling the toner density in the developing agent is changed to a value higher than the preset value in the initial stage of operation and fresh toner is supplied to the developing agent so that the toner density of the developing agent is increased in comparison to the reference level. Thereby, the developed density is prevented from decreasing due to an excess amount of friction charge of the toner.

Developing unit for electro-photographic apparatus

An electrophotographic apparatus system or an electrophotographic apparatus provided according to the present invention has the discrepancy of printing speed between tandem and single printing removed. The electrophotographic apparatus system or the electrophotographic apparatus is provided with printing speed changeover means 23a, 23b, 24 not only to select a printing speed applicable for the case where printing is effected with a plurality of electrophotographic apparatus A, B operatively linked together and another printing speed serviceable for the case where printing is implemented with each of plural electrophotographic apparatus put into separate run independently of one another, but also to shift the printing speeds from one to another, whereby the electrophotographic apparatus system or the electrophotographic apparatus may provide normal performance in each of the respective formations of printing.

Electrophotographic printing system including a plurality of

A toner density detection method for an electrophotographic apparatus in which driving of a rotary roll provided at an outlet of a special vessel is continued for a predetermined period of time (e.g., several seconds) after the operation of the electrophotographic apparatus is stopped. All or substantially all of the developing agent is thus exhausted or removed from the special vessel after the electrophotographic apparatus is stopped, so that the true permeability of the developing agent can be detected by a permeability sensor when the operation of the electrophotographic apparatus is restarted. As a result, the toner density of the developing agent can be controlled and kept normal, so that the printing quality can be stabilized.

Toner density detection method for electrophotographic apparatus

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Ibaraki, Japan

Isao Watanabe