VMware Known issues - Chaithanyaa7/VMware GitHub Wiki
- VM Performance Issues Symptoms:
Slow response times. High CPU or memory usage. Disk latency. Troubleshooting Steps:
Check Resource Utilization: Use vSphere Client or vCenter to check CPU, memory, and disk usage. Tools: esxtop or resxtop for real-time performance monitoring. VM Configuration: Ensure the VM has appropriate resources allocated. Avoid overcommitting CPU and memory. Host Performance: Check the host’s overall resource usage. Ensure that the host is not overcommitted. Storage Performance: Check for high latency in the storage subsystem. Ensure the datastore is not overloaded. Network Latency: Verify network performance between the VM and other network resources. VMware Tools: Ensure VMware Tools is up-to-date. 2. VM Won’t Power On Symptoms:
Error messages when attempting to power on a VM. VM stuck in an invalid state. Troubleshooting Steps:
Check Error Messages: Review the error messages displayed in the vSphere Client. Resource Availability: Ensure there are enough resources (CPU, memory) available on the host. Datastore Accessibility: Verify that the datastore where the VM resides is accessible. Configuration File Issues: Check the VM’s configuration file (.vmx) for corruption. Log Files: Review VM and host log files for specific errors. Snapshot Issues: If snapshots are present, ensure they are not causing issues. 3. vMotion Fails Symptoms:
vMotion operation fails with errors. VMs do not migrate successfully between hosts. Troubleshooting Steps:
Network Configuration: Ensure vMotion network is properly configured and reachable. Verify that vMotion is enabled on both source and destination hosts. Resource Availability: Ensure sufficient CPU and memory resources on the destination host. Compatibility Checks: Verify that the source and destination hosts are compatible. Use Enhanced vMotion Compatibility (EVC) if needed. Storage Accessibility: Ensure that shared storage is accessible from both hosts. License Check: Confirm that both hosts have the necessary vMotion licenses. 4. Host Connection Issues Symptoms:
Host disconnected from vCenter. Unable to manage host via vCenter. Troubleshooting Steps:
Network Connectivity: Check the network connectivity between vCenter and the host. Verify IP settings and DNS resolution. Management Agents: Restart the management agents on the ESXi host. Command: /etc/init.d/hostd restart and /etc/init.d/vpxa restart. Resource Issues: Ensure the host has sufficient resources and is not overloaded. Log Files: Review the vpxd.log on vCenter and hostd.log on the ESXi host for errors. Version Compatibility: Ensure the vCenter and ESXi host versions are compatible. 5. Storage Issues Symptoms:
Datastore inaccessible. VM disk I/O errors. Troubleshooting Steps:
Connectivity: Check network/storage paths between ESXi host and storage array. LUN Availability: Verify that the LUN is presented correctly to the ESXi host. Multipathing Configuration: Ensure multipathing is configured and functioning properly. Storage Logs: Review storage array and ESXi host logs for errors. Datastore Capacity: Ensure the datastore is not full. 6. Snapshot Issues Symptoms:
Snapshots fail to create, delete, or revert. VMs experience performance degradation due to snapshots. Troubleshooting Steps:
Datastore Space: Ensure sufficient free space on the datastore. Snapshot Chain: Avoid long snapshot chains as they can degrade performance. Consolidation: Use the “Consolidate” option to merge snapshot delta files. Log Review: Check VM logs for snapshot-related errors. Backup Solutions: Ensure backup solutions are not leaving orphaned snapshots.