Asynchronously shadowing record updates in a remote copy session

Details Asynchronously shadowing record updates in a remote copy session Asynchronously shadowing record updates in a remote copy session

1995-07-25

1998-02-17

Beausoliel, Jr., Robert W.

G06F 1100

Patent

active

057200297

ABSTRACT:
A disaster recovery system providing asynchronous remote data shadowing between a primary and a secondary site uses a pair of track arrays for each primary data storage device of a remote copy pair to monitor which record updates are in transit between the primary site and the secondary site. A host processor at the primary site of the disaster recovery system transfers a sequentially consistent order of copies of record updates to the secondary site for back-up purposes. The copied record updates are stored on the secondary data storage devices which form remote copy pairs with the primary data storage devices at the primary site. One track array, the active track array, is used to set elements according to which tracks on the primary data storage device receive record updates from the host processor at the primary site. The other track array, the recovery track array, designates which record updates comprise the copied record updates currently transferred from the primary site to the secondary site for data shadowing and is used for recovery should an error interrupt the transfer. The track arrays are toggled once the consistency group transfer completes, the recovery track array becoming the active track array and the active track array becoming the recovery track array.

REFERENCES:
patent: 5263154 (1993-11-01), Eastridge et al.
patent: 5280611 (1994-01-01), Mohan et al.
patent: 5375128 (1994-12-01), Menon et al.
patent: 5375232 (1994-12-01), Legvold et al.
patent: 5379398 (1995-01-01), Cohn et al.
patent: 5398331 (1995-03-01), Huang et al.
patent: 5440727 (1995-08-01), Bhide et al.
patent: 5504861 (1996-04-01), Crockett et al.
patent: 5544347 (1996-08-01), Yani et al.
patent: 5555371 (1996-09-01), Duyanovich et al.
patent: 5574950 (1996-11-01), Hathorn et al.
patent: 5577222 (1996-11-01), Micka et al.
patent: 5592618 (1997-01-01), Micka et al.
patent: 5594900 (1997-01-01), Cohn et al.
patent: 5615329 (1997-03-01), Kern et al.
IBM TDB, V. 29, n. 11, Apr. 1987, p 4816, "DASD Update Processing".
IBM TDB, V. 36, n. 03, Mar. 1993, pp. 483-486, "Fast Dual Write".
IBM TDB, V. 37, n. 04B, Apr. 1994, pp. 29-31, "Fast Zeroing of a Storage Device".

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