Applies to E-Series Answer I/O shipping occurs when 75% of the I/O is sent to the alternate controller over a five-minute window, IO shipping implicit volume transfer is recorded. This is by design an...Applies to E-Series Answer I/O shipping occurs when 75% of the I/O is sent to the alternate controller over a five-minute window, IO shipping implicit volume transfer is recorded. This is by design and cannot be disabled. Additional Information additionalInformation_text