Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2011-06-14
2011-06-14
Beausoliel, Robert (Department: 2113)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S005110, C714S021000, C714S050000
Reexamination Certificate
active
07962780
ABSTRACT:
A method, system, and computer program product to preserve data integrity in a mirror and copy environment is disclosed herein. In one embodiment, a method may include receiving a write command and data from a host device. The method may further include writing the data to a primary storage device and attaching a primary sequence number associated with the primary storage device to the write command, thereby providing a numbered write command with a command sequence number. The numbered write command may then be transmitted to a secondary storage device. The method may further include comparing the command sequence number to a secondary sequence number associated with the secondary storage device. If the command sequence number matches the secondary sequence number, then the command may be executed. Otherwise, it may be ignored.
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Harris, Jr. Theodore Timothy
Kalos Matthew Joseph
Klein Steven Edward
Spear Gail Andrea
Beausoliel Robert
International Business Machines - Corporation
Lottich Joshua P
Nelson Alexis V.
Nelson Daniel P.
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