Identify hot volumes and other objects in ONTAP System Manager
Accelerate your cluster performance by identifying the frequently accessed volumes (hot volumes) and data (hot objects).
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Beginning with ONTAP 9.10.1, you can use the Activity Tracking feature in File System Analytics to monitor hot objects in a volume. | 
Steps
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Click Storage > Volumes.
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Filter the IOPS, latency, and throughput columns to view the frequently accessed volumes and data.