Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral adapting
Reexamination Certificate
2005-09-06
2005-09-06
Gaffin, Jeffrey (Department: 2182)
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral adapting
C710S062000, C710S064000, C710S072000, C714S001000, C714S002000, C714S006130, C714S042000, C707S793000, C707S793000, C711S100000, C711S161000, C711S162000, C709S200000, C709S201000, C709S213000, C709S216000, C709S217000, C709S218000
Reexamination Certificate
active
06941396
ABSTRACT:
A bi-directional reflective memory channel between a pair of storage controllers is used to maintain a mirrored copy of each storage controller's native buffer contents within the buffer of the other storage controller. To maintain such mirrored copies, buffer write operations that fall within a reflective memory segment of one storage controller are automatically reflected across this channel to the other storage controller for execution, and vice versa. The write operations are preferably transmitted across the reflective memory channel using a protocol that provides for error checking, acknowledgements, and retransmissions. This protocol is preferably implemented entirely in automated circuitry, so that the mirrored copies are maintained without any CPU intervention during error-free operation. When a failover occurs, the surviving storage controller uses the mirrored copy of the failed storage controller's native buffer contents to assume control over the failed storage controller's disk drives.
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Brenes Erasmo
O'Neil Stephen
Shen Alec
Thorpe Roger T.
Gaffin Jeffrey
Istor Networks, Inc.
Knobbe Martens Olson & Bear LLP
Nguyen Tanh Q.
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