Patent ID: 7823008

Claim:
An apparatus configured to operate as a primary for a remote copy pair system, the apparatus comprising: a journal component for generating journal entries responsive to one or more uncompleted sequenced batches; a configurator responsive to an error indication from a secondary for enumeration of said one or more uncompleted sequenced batches; and a primary server responsive to said enumeration of said one or more uncompleted sequenced batches to reissue to said secondary one or more write requests for said one or more uncompleted sequenced batches, during recovery processing; one or more I/O processors issuing a request for a sequence number to a primary client; the primary client issuing the request for a sequence number to the primary server; the primary server issuing a new batch request to the secondary server batching up a plurality of requests that have been received from the primary clients; and the secondary server sending a confirmation message for the specified sequence number to the secondary client; wherein the primary server grants the request for a sequence number to the primary client, and the primary client passes a request granted message to a requesting I/O processor, and wherein the I/O processor in turn issues a write for the specified sequence number to the primary client and the primary client issues the write request for the specified sequence number to the secondary client.