Perform Update Precheck - Versions Prior to SDDC Manager 5.0

If you have not yet upgraded to SDDC Manager 5.0, these are the steps to run a Precheck. You must perform a precheck before applying an update or upgrade bundle to ensure that your environment is ready for the update.

If you silence a vSAN Skyline Health alert in the vSphere Client, SDDC Manager skips the related precheck and indicates which precheck it skipped. Click Restore Precheck to include the silenced precheck. For example:

You can also silence failed vSAN prechecks in the SDDC Manager UI by clicking Silence Precheck. Silenced prechecks do not trigger warnings or block upgrades.

Important: You should only silence alerts if you know that they are incorrect. Do not silence alerts for real issues that require remediation.

Procedure

1. In the navigation pane, click Inventory > Workload Domains.
2. On the Workload Domains page, click the workload domain where you want to run the precheck.
3. On the domain summary page, click the Updates/Patches tab. The image below is a sample screenshot and may not reflect the correct product versions.
   
4. Click Precheck to validate that the environment is ready to be upgraded.

   Once the precheck begins, a message appears indicating the time at which the precheck was started.

5. Click View Status to see detailed tasks and their status. The image below is a sample screenshot and may not reflect the correct versions.
   
6. To see details for a task, click the Expand arrow.
   If a precheck task failed, fix the issue, and click Retry Precheck to run the task again. You can also click Precheck Failed Resources to retry all failed tasks.
7. If the workload domain contains a host that includes pinned VMs, the precheck fails at the Enter Maintenance Mode step. If the host can enter maintenance mode through vCenter Server UI, you can suppress this check for NSX and ESXi in VMware Cloud Foundation by following the steps below.
   1. Log in to SDDC Manager by using a Secure Shell (SSH) client with the user name vcf and password you specified in the deployment parameter workbook.
   2. Open the /opt/vmware/vcf/lcm/lcm-app/conf/application-prod.properties file.
   3. Add the following line to the end of the file:

      lcm.nsxt.suppress.dry.run.emm.check=true

      lcm.esx.suppress.dry.run.emm.check.failures=true

   4. Restart Lifecycle Management by typing the following command in the console window.

      systemctl restart lcm

   5. After Lifecycle Management is restarted, run the precheck again.

Results

The precheck result is displayed at the top of the Upgrade Precheck Details window. If you click Exit Details, the precheck result is displayed at the top of the Precheck section in the Updates/Patches tab.

Ensure that the precheck results are green before proceeding. A failed precheck may cause the update to fail.