ESX Host Summary
ESX Host Summary is the granular view of one hypervisor host: its hardware profile, what is constraining it, how utilization has moved, what it costs, and which VMs are sitting on it. When a cluster looks unbalanced, this is where you work out which host is the problem and what to move off it.
What this screen shows
- Host profile. Model, CPU, and memory, with the limiting factor identified.
- Utilization gauges and historical trends. Current position plus how it got there.
- VM build capacity. How much more this host can take, which may be negative.
- Resident VM list. Everything currently running on the host.
When to use it
- Troubleshooting a constrained host. Especially where the cluster around it looks fine, which points at placement rather than capacity.
- Deciding whether to evacuate or rebalance. The resident VM list is the raw material for that decision.
- Reviewing hardware and cost. Useful during refresh planning, where the oldest hosts and the most constrained hosts are not always the same ones.
Working a rebalance
Use the VM list to pick migration candidates. The best ones are usually large memory consumers with modest CPU demand, because memory is normally the binding constraint and moving one large VM relieves more pressure than moving several small ones.
Compare the CPU and memory trends before acting. A host that spikes at predictable times is behaving normally under a scheduled workload, and moving VMs off it will not change the spike. A host with a sustained upward trend on one resource is genuinely constrained and worth rebalancing.
Tip: Check the destination before you move anything. Relieving one host by overloading its neighbour is the most common rebalancing mistake, and the cluster-level view is the only place it is visible.
Related screens
All Units: Hosts is where a problem host is identified in the first place. Cluster Summary shows whether the cluster has room to absorb a rebalance. VM Summary validates individual migration candidates.