Patent ID: 7454655

Claim:
A method for initiating a data storage facility recovery process in a data processing system having a first peer data storage facility and a second peer data storage facility communicating with the first peer data storage facility by a first communication link, the method comprising: executing a first write operation to store data from a host computer to the first peer data storage facility; executing a second write operation to copy the stored data over the first communication link from the first peer data storage facility to the second peer data storage facility; monitoring in the second peer data storage facility the data associated with the second write operation to determine if the data contains an error; and transmitting an instruction from the second peer data storage facility to the first peer data storage facility to initiate a first error recovery operation on the first peer data storage facility upon detection of the error, including an instruction for the first peer data storage facility to store a first root cause data set comprising a record of the state of the first peer data storage facility at the time of determination of the error and a continuous event log buffer.