VMware ESXi Host Performance Troubleshooting Checklist

!Issue

Use a structured checklist to investigate ESXi CPU, memory, storage and network performance problems.

✓Solution

01 Check CPU contention

★Recommendations

06 Validate improvement Measure the same indicators after remediation and document the evidence used to close the incident.

Review host CPU utilization, ready time and co-stop indicators. Determine whether contention is isolated to a VM or affects the host.

Check CPU contention

Review active memory, ballooning, compression and swapping. Identify whether one workload is consuming disproportionate memory.

Compare datastore and device latency across workloads. Correlate performance changes with storage events and backup activity.

Review physical uplink and port statistics for drops, errors or saturation. Compare affected and healthy hosts.

Correlate the start of the issue with VM moves, snapshots, patches, storage maintenance or network changes.

Measure the same indicators after remediation and document the evidence used to close the incident.

Continue with practical infrastructure troubleshooting, PowerShell scripts and operational runbooks.