Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2008-03-25
2008-03-25
Wilson, Yolanda L (Department: 2113)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S748000, C714S749000
Reexamination Certificate
active
11218134
ABSTRACT:
Systems and methods for performing error recovery in a system utilizing redundant communication links. In one embodiment, a host device is coupled to a sequential device such as a tape drive by a pair of Fiber Channel links. The host is configured to associate an identifier with each command. Upon detecting a failure of the transmission of the command via the first link, the host re-transmits the command via the second link. When the link failure is detected, the status of the last command transmitted before the failure is requested. After receiving the status of the command, a request that recovery start (possibly at a point indicated by the status information) is transmitted to the sequential device. If the recovery request is accepted, performance of the command is completed.
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Device Driver—http://en.wikipedia.org/wiki/Device—Driver.
Shim—http://www.answers.com/shim&r=67#after—ad2.
International Search Report for PCT/US03/21415 Oct 27, 2003.
European Search Report for related EP Application No. 03764399.6 Feb. 10, 2006.
Moody, II William H.
Tyndall John F.
Crossroads Systems Inc.
Sprinkle IP Law Group
Wilson Yolanda L
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