Heuristics for Balancing:
VM Load Balancing considers two heuristics:- Current Memory pressure: Evaluates the memory usage of each node.
- CPU utilization: Monitors CPU usage averaged over a 5-minute window.
Controlling Aggressiveness of Balancing:
To configure the balancing aggressiveness:Open PowerShell.
Run (Get-Cluster).AutoBalancerLevel = <value>
AutoBalancerLevel values:
- (default): Low aggressiveness, moves VMs when host is >80% loaded.
- Medium aggressiveness, moves VMs when host is >70% loaded.
- High aggressiveness, averages nodes, and moves VMs when host is >5% above average.
Controlling VM Load Balancing:
To configure when load balancing occurs:Using Failover Cluster Manager:
- Right-click on cluster name, select "Properties."
- Go to the "Balancer" pane and configure desired settings.
Using PowerShell:
- Open PowerShell.
- Run (Get-Cluster).AutoBalancerMode = <value>
AutoBalancerMode values:
- 0: Disabled.
- 1: Load balance on node join.
- 2 (default): Load balance on node join and every 30 minutes.
VM Load Balancing vs. SCVMM Dynamic Optimization:
For deployments without SCVMM, VM Load Balancing provides in-box functionality. However, for SCVMM deployments, SCVMM Dynamic Optimization is recommended for load balancing. SCVMM automatically disables VM Load Balancing when Dynamic Optimization is enabled.
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