Resources Contact Us Home
Disk array device

Image Number 2 for United States Patent #6145067.

A disk array apparatus includes a plurality of physical disks forming a physical disk group which is logically divided into a plurality of unit areas. The unit areas are combined into a logical disk. This device includes a control section, a logical disk reconfiguration executing section, a P-EXTENT copying means, a read means, a write means, and a double write means. The control section controls an access to the logical disk in accordance with an external request. The logical disk reconfiguration executing section reconfigures the logical disk in accordance with an external request. The P-EXTENT copying means copies data from a unit area as a reconfiguration source to a unit area as a reconfiguration destination when the logical disk is reconfigured. The read means reads out data from a unit area. The write means writes data in a unit area that is not being reconfigured. The double write means writes data in both the unit area as the reconfiguration source and the unit area as the reconfiguration destination when the data is written in the unit area that is being reconfigured.

  Recently Added Patents
High-density 3-dimensional structure
Photoacoustic joulemeter utilizing beam deflection technique
Near-field transducers for focusing light
Method for producing carrier on which microorganisms capable of conducting multiple parallel mineralization are immobilized, column reactor and solid medium for cultivating plants
Produce container and lid assembly
Pet urn enclosure
Stereoscopic display
  Randomly Featured Patents
Method and apparatus for transmitting signals in an optical fiber
Method of diagnosing pathological state of tumor cells using a diagnostic agent for glycometabolic function
Semiconductor memory device having dummy word line
Ultrasonic imaging by radial scan beams emanating from a hypothetical point located behind linear transducer array
Method and apparatus for testing multiple data signal transceivers substantially simultaneously with common transceiver tester
Housing for a hearing aid or hearing device respectively
Nondestructive method for chemically machining crucibles or molds from their enclosed ingots and castings
Method for bonding copper plate to alumina substrate and process for producing copper/alumina bonded assembly
Electrical connector with coding
Adaptive comparator circuit and acoustic distance sensor comprising said circuit