Information processing system and control method

An information processing system comprising:

• a plurality of primary-side storage systems including respective logical volumes;
• and
• one or more secondary-side storage systems configured to copy data of the respective logical volumes included in the plurality of primary-side storage systems, wherein
• each of the plurality of primary-side storage systems includes:
• a control unit configured to accept and process an input/output (I/O) command specifying a corresponding one of the logical volumes;
• and
• a management unit configured to transmit, to the control unit, a stop instruction instructing the control unit to stop accepting the I/O command, at a predetermined cycle,
• the management unit is configured to transmit, to the control unit, test packets, at a transmission cycle set by a user,
• the control unit is configured to receive the test packets transmitted from the management unit, and count a number of received packets, and
• the management unit is configured to:
• acquire, from the control unit, the number of received packets;
• perform evaluating the transmission cycle based on the number of received packets;
• and
• present, to the user, a result of the evaluating.