Title:
REMOTE MIRRORING SYSTEM, DEVICE, AND METHOD
Document Type and Number:
WIPO Patent Application WO2001013235
Kind Code:
A9
Abstract:
In a remote mirroring system, device, and method, a master storage unit stores information in a log and uses the information from the log to quickly resynchronize slave images following a failure in the master storage unit. Upon receiving a write request from a host, the master storage unit stores a write entry in the log. The write entry includes information that identifies a portion of the slave images that may be unsynchronized from the master image due to the write request. The master storage unit then proceeds to update the master image and the slave images. The log is preserved through the failure, such that the log is available to the master storage unit upon recovery from the failure. When the master storage unit is operational following the failure, the master storage unit resynchronizes the slave images to the master image by copying those portions of the master image indicated in the log to the slave images.
Inventors:
DUPREY DENNIS
LUCOVSKY JEFFREY
ROA GUILLERMO
LUCOVSKY JEFFREY
ROA GUILLERMO
Application Number:
PCT/US2000/021193
Publication Date:
September 06, 2002
Filing Date:
August 02, 2000
Export Citation:
Assignee:
EMC CORP (US)
International Classes:
G06F3/06; G06F11/14; G06F11/20; G06F12/00; (IPC1-7): G06F11/14
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