How to determine that a virtual environment is operating under hypervisor overload conditions and the system lacks resources?

To determine if a virtual environment is experiencing excessive hypervisor load and resource shortages, it is necessary to monitor several key indicators:

• High CPU load at the hypervisor level: if the total CPU load of virtual machines exceeds the physical capacity, it leads to delays.
• High input-output (I/O) wait times: indicates that the disk subsystem or network is overloaded.
• Memory metrics: frequent swapping or lack of free memory on the hypervisor.
• Network and disk latency metrics.

Monitoring can be done using hypervisor tools (e.g., VMware vSphere Client, Hyper-V Manager) or third-party monitoring systems (Zabbix, Prometheus). It is important to look at metrics both at the host level and inside virtual machines to understand where the bottleneck occurs.

Example: if a virtual machine shows high CPU load but the host CPU is free, the problem is likely within the VM. If the host CPU is 100% loaded and VMs are slow, then the hypervisor is overloaded.