Invention Grant
- Patent Title: Accelerated recovery in data replication environments
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Application No.: US15098355Application Date: 2016-04-14
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Publication No.: US09891849B2Publication Date: 2018-02-13
- Inventor: Joshua J. Crawford , Paul A. Jennas, II , Jason L. Peipelman , Matthew J. Ward
- Applicant: International Business Machines Corporation
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Nelson and Nelson
- Agent Daniel P. Nelson; Alexis V. Nelson
- Main IPC: G06F3/06
- IPC: G06F3/06

Abstract:
A method for accelerating recovery in a data replication environment includes maintaining a secondary out-of-sync bitmap for a secondary volume. The secondary out-of-sync bitmap indicates which storage elements on the secondary volume are not synchronized with storage elements on a primary volume. The method further generates, for the primary volume, a tracking bitmap indicating which storage elements on the primary volume need to be updated with data from the secondary volume. This tracking bitmap is initialized with values from the secondary out-of-sync bitmap. Upon receiving a write from the secondary volume to a storage element on the primary volume, the method resets the corresponding bit in the tracking bitmap. Upon receiving a write from a host system to a storage element on the primary volume, the method also resets the corresponding bit in the tracking bitmap. A corresponding system and computer program product are also disclosed.
Public/Granted literature
- US20170300244A1 ACCELERATED RECOVERY IN DATA REPLICATION ENVIRONMENTS Public/Granted day:2017-10-19
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