Method for providing read/write access while copying data betwee

Details Method for providing read/write access while copying data betwee Method for providing read/write access while copying data betwee

1998-10-27

2000-10-03

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711150, 711114, G06F 1202

Patent

active

061286990

ABSTRACT:
A storage system for storing and retrieving data records having a plurality of storage devices and a system controller. The storage devices include a storage medium, a device controller, and a message log. The storage medium stores data records, the data records being indexed by addresses which specify the location of the data records in the storage medium. The device controller receives write messages from processors coupled to the controller. Each write message includes a data segment to be written to the storage medium at a specified address, and linkage information specifying a timestamp, the addresses of other data records on other storage systems that were written in the same write operation, and the original source of the data segment. The system controller is responsive to a copy-write message specifying a source region on one of the storage devices, the "source", that is to be copied to a target region on one of the storage devices, the "target". The copy-write message specifying said source region, said target region, and said target. The copy-write message causes the system controller to read the source region and the linkage records associated therewith, to modify the associated linkage records to indicate that the source region on the target is the original source of the source region if the source region was not created by a previously executed copy-write message, and to write the source region and the associated linkage records, including any modifications thereto, to the target via one of the write messages.

REFERENCES:
patent: 5247618 (1993-09-01), Davis et al.
patent: 5247665 (1993-09-01), Matsuda et al.
patent: 5297258 (1994-03-01), Hale et al.
patent: 5546536 (1996-08-01), Davis et al.
patent: 5592648 (1997-01-01), Schultz et al.

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