Snapshot copy of a secondary volume of a PPRC pair

Details Snapshot copy of a secondary volume of a PPRC pair Snapshot copy of a secondary volume of a PPRC pair

1998-01-26

2000-10-10

Nguyen, Hiep T.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711114, 711161, 711165, 707204, 714 6, G06F 1216

Patent

active

061311480

ABSTRACT:
The present invention provides a method and apparatus for setting up a Peer-to-Peer Remote Copy (PPRC) session and snapshot copying a remote secondary volume to another volume on the remote subsystem. The apparatus includes a primary storage subsystem having a primary data-storage device with at least a primary volume. A primary processing unit relays a request to perform a snapshot copy of at least a portion of the primary volume to a secondary storage subsystem. The secondary storage subsystem includes a secondary data-storage device having a secondary volume which is maintained in a duplexed state with the primary volume through the use of remote copy sessions. A secondary processing unit, responsive to the relayed request can perform an equivalent of a snapshot copy of at least a portion of the primary volume by making a snapshot copy of a corresponding portion of the secondary volume.

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