Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2006-05-19
2009-08-25
Iqbal, Nadeem (Department: 2114)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
Reexamination Certificate
active
07581136
ABSTRACT:
A storage system stores I/O operations in a journal volume in a chronological order and with assigned sequence numbers. When a predefined command to be logged is received, the storage system transmits a log of the command to an external server with the information of a particular sequence number of the I/O operation that is influenced by the command. When a log entry is identified as necessitating data recovery, such as by being issued maliciously, the I/O operations with sequence numbers larger than the particular sequence number of the identified log entry are discarded. A log analysis module is located separately from the storage system on the external server, and is able to identify the particular sequence number of the I/O operation which is affected by the malicious command so that instructions may be sent to the storage system regarding the sequence numbers of the commands to be discarded.
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Hitachi , Ltd.
Iqbal Nadeem
Mattingly & Malur, P.C.
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