When you open the Administration editor for a particular SAP HANA system, the Overview tab provides you with a summary of the overall status of the system, as well as an overview of resource usage.
The following figure shows an example of the system overview of a distributed system.
Resource usage values are presented in such a way that you can compare the SAP HANA system with the operating system as a whole.
If the system is distributed, resource usage values are aggregated across all hosts. An additional bar shows the host with the highest (most critical) resource usage.
The bars indicating resource usage (memory, CPU, and disk) change color (green, yellow, and red) based on configurable check thresholds.
Reference: SAP HANA Administration Guide (See page no 66) – Google hana_admin_en.pdf to download detailed Administration guide