document updating a database partitioning the source device fig3 b shows example formats of aim files aimf 1 and aimf 2 as shown the files have a header portion and i o control block portion and a data portion the header portion includes information on the total size of aim file aimf 1 it also includes a pointer to the next aim file in the queue to be transferred in this case aim file aimf 2 it further contains a pointer to the i o control block portion which indicates the offset where the i o control block portion of the file begins finally the header portion includes a pointer to the data portion which indicates the offset where the data portion of the file begins the i o control block portion indicates the address offsets where each transaction in the file is to be stored on the destination or source device and a length indicator which indicates the size of the data for each transaction accordingly since aim file aimf 1 includes transaction a the i o control block portion includes offset a length a which indicates where the data associated with transaction a is to be stored on the remote destination device and the total length or size of the data to be stored on the remote storage system moreover since aim files aimf 1 also includes transaction b the i o control block portion also includes offset b length b which indicates where the data associated with transaction b is to be stored on the remote storage device and the total length or size of the data to be stored on the remote storage system finally the data portion of the file contains the data for each transaction.