How do I ensure there is adequate storage for the ancillary input queue (AIQ) for z/OS Enterprise Extender traffic?

Each AIQ increases storage utilization by an amount equal to 36K of fixed ECSA, plus potentially the READSTORAGE value (64K multiplied by the number of SBALs) of fixed CSM 4K data space storage.

If you have configured QDIO inbound workload queuing, you must ensure that there is sufficient fixed ECSA and 4K CSM dataspace storage for the AIQ for EE traffic.

Follow these steps:

1. Count the total number of OSA-Express3, and later, interfaces that are coded with the WORKLOADQ parameter on the IPAQENET and IPAQENET6 INTERFACE statements. Make a note of the number.

2. Verify that sufficient ECSA is available. To do this, multiply the total number of OSA-Express3, and later, interfaces that have inbound workload queueing enabled (you determined this number in step 1) by 36K. The resulting number indicates how much new ECSA is required. Use the DISPLAY CSM command to verify that sufficient ECSA is available to enable this function.

3. Verify that sufficient real storage is available. 64-bit real storage is used for the dataspace read buffers. Multiply the total number of OSA-Express3, and later, interfaces that have inbound workload queueing enabled (determined in step 1) by 64K and by 126 (8064K). The maximum number of read buffers per queue is 126. The resulting number is approximately the amount of additional 64-bit real storage that is required for the data space read buffers for all the new EE input queues.

4. If sufficient storage is not available, either increase the available storage or consider defining some of the OSA-Express3, and later, INTERFACE statements with the NOWORKLOADQ parameter.