Method and apparatus for controlling reconfiguration of storage-

Details Method and apparatus for controlling reconfiguration of storage- Method and apparatus for controlling reconfiguration of storage-

1995-03-13

1997-11-04

Moore, David K.

395415, 395416, 395419, 395406, 395427, 3954211, G06F 1200, G06F 1202, G06F 926, G06F 932

Patent

active

056849745

ABSTRACT:
An apparatus and method for controlling the reconfiguration of the physical storage area in a real storage device employed by an information processing system.
The invention includes an address reconfiguration array having a plurality of storage blocks which are each assigned to a virtual computer. Each storage block is composed of a plurality of host real-address entries. Assigned to a storage area in the logical memory of a virtual computer, each host real-address entry includes a validity field containing a validity bit and a host real-address field containing a high-order part of the start address of a real storage segment allocated to the storage area. The invention also includes a selector which receives the identifier of a virtual computer and a logical address from the virtual computer, and makes use of the identifier for choosing a storage block from the address reconfiguration array and a high-order portion of the logical address for selecting a host real-address entry from the chosen storage block. The value of the host real-address field of the selected host real-address entry, the high-order part of a real address, is then read out from the selected host real-address entry, and is merged with the low-order portion of the logical address in order to create a real address. If the validity bit indicates that the contents of the host real-address entry are invalid, however, the virtual computer is interrupted. A change to the contents of the address reconfiguration array can be made by replacing the contents of a host real-address entry chosen by the selector with update data.

REFERENCES:
patent: 3723976 (1973-03-01), Alvarez et al.
patent: 4075694 (1978-02-01), Ericsson
patent: 4685057 (1987-08-01), Lemone et al.
patent: 4761737 (1988-08-01), Duvall et al.

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