Network Appliance NS0-516 Practice Test 1

What is represented by the Headroom graph on the SANtricity System Manager performance tab?
the percentage of I/O associated with the backend disk drives
the remaining performance capability of the physical objects in the storage system
the percentage of CPU processing capacity that is being used by the operations on the system
the resources that are being consumed by a defined workload
The Headroom graph in SANtricity System Manager shows the remaining performance capability of the physical objects (e.g., disks, SSDs) in the storage system.
This helps in understanding how much additional load the system can handle before reaching its performance limits.
Reference: NetApp SANtricity System Manager User Guide, which explains the performance monitoring features.