below.

Explanation:

To prepare the system for maintenance mode and avoid unnecessary vSAN re-synchronization, follow

these steps:

Log in to vSphere Client:

Open the vSphere Client.

Enter the username: [email protected].

Enter the password: VMw@r3!123.

Click Login.

Navigate to the Host:

In the vSphere Client interface, navigate to Hosts and Clusters.

Expand the VxRail-DC and then the VxRail-Cluster.

Select the Host for Maintenance:

Select the host you plan to put into maintenance mode (e.g., vcluster730-esx01.edu.local,

vcluster730-esx02.edu.local, etc.).

Enter Maintenance Mode:

Right-click on the selected host and select Enter Maintenance Mode.

In the Enter Maintenance Mode window, you will have several options for vSAN data migration. To

avoid unnecessary re-synchronization, choose Ensure Accessibility.

Ensure Accessibility: This option makes sure that the data remains accessible during maintenance but

does not immediately trigger full data migration. It is the best choice to avoid unnecessary re-

synchronization during a short maintenance window.

Confirm Maintenance Mode:

Click OK to confirm the selection and put the host into maintenance mode.

Verify the Host Status:

Monitor the status to ensure the host enters maintenance mode without triggering excessive re-

synchronization.

Reference:

VMware vSAN Maintenance Mode Options: vSAN Maintenance Mode

=========================

To summarize, selecting Ensure Accessibility when entering maintenance mode helps to avoid

unnecessary vSAN re-synchronization during the maintenance window. This method ensures that

data remains accessible and minimizes the impact on the cluster’s performance and availability

during the maintenance activity.