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AssigneeEMC Corporation
InventorsPhilip E. Tamer, Douglas E. LeCrone, Arieh Don
Estimating the term…
A method and apparatus for assuring data consistency during certain operations involving dependent input/output sequences. During such operations a stall application blocks write operations to specified logical devices in a local consistency group while allowing read operations to all devices and write operations to non-specified logical devices. When a write command is directed to a logical device in local consistency group, the host adapter associated with the logical device returns a message to the host that initiates a write command retry. Retries generally continue until a write command is successful.
A method for maintaining data consistency in a group of logical devices wherein each logical device is adapted for normally responding to read and write commands issued by a host by performing a commanded operation and by transferring a message to the host indicating the outcome of the command operation, said method comprising the steps of:
A system for maintaining data consistency in a group of logical devices wherein each logical device is adapted for normally responding to read and write commands issued by a host by performing a commanded operation and by transferring a message to the host indicating the outcome of the commanded operation, said system comprising:
Dependencies are inferred from the claim text.