High Disk Utilization on NetApp FAS

Hi,

We are currently experiencing high disk utilization on our NetApp FAS. most of the time the utilization is peaking at around 95-100%.

We barely manage with this but there are times where application gets slower.

I have collected WAFLTOP logs, Sysstats and Statit commands, But I am not sure on what specific fields to check where the bottleneck is while having high I/O Utilization (Storage Level, Application Level, etc.)

System: NetApp FAS3250 (ONTAP 8.2.4P6 7-Mode)

Any feedback would be much appreaciated.

Regards,