You may specify that both MIH processing and I/O timing processing monitor your I/O requests. When the value you specify for the I/O limit is less than or equal to the value you specify for MIH, I/O timing processing takes precedence over MIH processing. The system will abnormally end the I/O request when it exceeds the I/O timing limit that you have specified. MIH processing will not get control.
When the value that you specify for the I/O timing limit is greater than the value that you specify for MIH, normal MIH recovery will be in effect until the I/O timing limit is reached. Once the I/O request exceeds the I/O timing limit that you have specified, the system will abnormally end the I/O request.
To get the full benefit of MIH recovery, your MIH time intervals plus your MIH time intervals for the HSCH and CSCH instructions should be at least 1 second less than your I/O timing limit.