OPERATIONAL DEFECT DATABASE
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Issue is seen during remediation of the hosts in the cluster is using Baseline or Single ImageThe remediation task completes without applying the patches on the host and no error is seenConfiguration can be validated from the vCenter server logs as below /var/log/vmware/vmware-updatemgr/vum-server/vmware-vum-server.log YYYY:MM:DDTHH:MM:SS info vmware-vum-server[09428] [Originator@6876 sub=Telemetry] [TelemetryManager 423] Sending telemetry data: {"@type":"pman_effective_coordinator_policy","taskId":"87196477-d0e7-4871-98c4-e6d7bf6c58f0|5285ccbe-a7b1-99bb-5965-61d604baac7e","entityId":"87196477-d0e7-4871-98c4-e6d7bf6c58f0|domain-c8","failureAction":"RETRY","failureActionRetryDelay":300,"failureActionRetryCount":3,"preRemediationPowerAction":"DO_NOT_CHANGE_VMS_POWER_STATE","enableQuickBoot":true,"disableDpm":true,"disableHac":false,"evacuateOfflineVms":false,"enforceHclValidation":false,"parallelRemediationEnabled":true,"maxHostsForParallelRemediation":0}
This is an expected behavior.Parallel remediation reduces the time needed for patching or upgrading the hosts in your environment. The remediation in parallel only applies for ESXi hosts that are already in maintenance mode. During parallel remediation, hosts do not enter or exit maintenance mode automatically. To remediate hosts in parallel, host must be set to enter and exit maintenance mode manually. If parallel remedation is enabled, vSphere Lifecycle Manager does not remediate the ESXi hosts that are not in maintenance mode.For additional information, refer to Remediating ESXi Hosts Against vSphere Lifecycle Manager Baselines and Baseline Groups
To resolve the issue, implement either of the below steps Put the host in maintenance mode manually before initiating the remediationDisable Parallel Remediation under Lifecycle Manager To disable parallel remediation, please follow the steps below Log in to vCenter Server via vSphere ClientClick on vSphere Client on the top left to navigate to HomeSelect Lifecycle Manager Select Settings -> Baselines and then click on [EDIT] Un-check Parallel remediation, then click on [SAVE] Proceed with the remediation
Reference: https://core.vmware.com/blog/vsphere-lifecycle-manager-feature-spotlight-parallel-remediation
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