Not long ago, I have the same question about the definition of this term and here's the answer:
Data Transfer Time - the total time it takes to send the total backup data from TSM client to TSM server over the network. *** My understanding of this definition is : client process will read data from disk into I/O buffer, then from I/O buffer to TSM server through the network. When TSM server receive these data, it will send a ACK packet back to the client. When the client receive the ACK packet from TSM server, then it will read the next segment of data from disk to I/O buffer. ===> Data Transfer Time is the total sum of time that the client send the data to server through network including the time it receive the ACK packet but exclude the time to fetch the next batch of data into the I/O buffer. Network data transfer rate - the rate that TSM client send the data over the network to TSM server. *** My understanding of this definition is : the total amount of data send to TSM server divided by the data transfer time Thanks & Regards William