Multiplex communications – Wide area network – Packet switching
Patent
1994-04-05
1998-03-03
Lee, Thomas C.
Multiplex communications
Wide area network
Packet switching
39520009, 370468, 370477, G06F 1200
Patent
active
057245398
ABSTRACT:
A method and apparatus for bandwidth balancing of data transfer operations between a computer and a storage subsystem are disclosed. The storage subsystem contains a number of storage devices such as magnetic disk drives. Data to be stored is supplied by the computer to the storage subsystem in the form of a transfer unit through a communication channel. The storage subsystem divides the transfer unit into a number of stripes of a pre-determined size. Each stripe is allocated to a separate disk drive whose disk surfaces are formatted into a number of track bands. Each track band is composed of several contiguous tracks associated with the same data transfer rate. Each stripe is then stored on its disk drive within a selected track band. Both data storage and retrieval from each disk drive occur at the data transfer rate associated with the accessed track band. Since all the stripes in the transfer unit are transferred to their disk drives simultaneously, the transfer operation occurs at an aggregate transfer rate equal to the sum of the individual track band transfer rates. The storage subsystem selects the track bands on each disk drive in such a manner as to ensure that the data transfer operation occurs at an aggregate transfer rate within a pre-determined bandwidth range of the communication channel bandwidth.
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"New Direction in Switching Networks", Kundis & Hartman, 1986 International Zurich Seminar on Digital Communications.
Buch Bruce D.
Riggle Charles Michael
Digital Equipment Corporation
Fisher Arthur W.
Hudgens Ronald C.
Kim Ki S.
Lee Thomas C.
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