Producing a mirrored copy using reference labels

Details Producing a mirrored copy using reference labels Producing a mirrored copy using reference labels

1996-09-17

1998-07-28

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711112, 39518204, G06F 1216

Patent

active

057874859

ABSTRACT:
A mirror set copy from a first storage device to a second storage device is performed in a computer system in which write requests are each associated with a reference label. Write requests and a mirror read request are received at the first storage device, and the write requests also are received at the second storage device. The write requests are processed at the first storage device processes. Data is read from the first storage device in response to the mirror read request. The first storage device then sends the data to the second storage device along with a reference label of a write request received at the first storage device prior to sending the data. Thereafter, the second storage device writes the data. Finally, the second storage device processes write requests until the second storage device encounters a write request having the same reference label as that sent with the data.

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Davis, "Design of VMS Volume Shadowing Phase II--Host-Based Shadowing," Digital Technical Journal, vol. 3, No. 3, Summer 1991, pp. 7-15.

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