Applies to ONTAP 9 AFF systems FAS systems C-Series TSSE Issue High CPU utilization (near or at 100%) without increase in IOPS or Throughput. This could also be reported/observed post an ONTAP upgrade...Applies to ONTAP 9 AFF systems FAS systems C-Series TSSE Issue High CPU utilization (near or at 100%) without increase in IOPS or Throughput. This could also be reported/observed post an ONTAP upgrade. TSSE Scan is the listed as the top consumer for CPU from wafltop. How to run wafltop. TSSE is enabled on many volumes.