N series 3300 single controller (FAS2020), 1 aggregate RAID-DP with 8 x 750GB SATA disk 7200rpm, 1 Gbps ethernet link, 1 small root volume and 1 big data volume, CIFS only, sample windows 9:30-12:30 "full business time"
cifs_ops avg: 1633 max: 5265
cifs_read_ops avg: 489 max: 2216
cifs_write_ops avg: 286 max: 1325
cifs_latency avg: 0,41 max: 14,4
processor_busy avg: 16,5 max: 49
is this a "stressed" nas?
what other parameters can I monitor for better understand the utilization of the appliance?
That does sound like a good bit for a 2020 especially with that disk setup.
Do you have Operations Manager in the environment? If so, the aggregate disk busy graph in Performance Advisor (comes free with OM) would be the best way to know for sure.