When a host goes offline, it may cause errors on the vCenter dashboard, and the summary page of the VMs may display Noncompliant VM Storage Policies. The administrator should check the vSAN object health to identify and repair any objects that are in a non-compliant state. The following steps can be taken:
Go to the vCenter Server's Monitor tab
Select vSAN from the left-hand menu
Select Skyline Health from the sub-menu
Select Data from the sub-sub-menu
Select vSAN object health
This will give you an overview of the vSAN object health, you can check the objects that are in a non-compliant state and use the "Repair Objects" button to repair them.
It's important to also check the reason why the host was offline, and fix it before bringing it back to the cluster.
You can also check the triggered alarms related to vSAN in Monitor -> Triggered Alarms -> vSAN object alarms, to ensure that all issues related to vSAN are resolved.
This page will display any objects that are not compliant with the storage policy and will allow the administrator to take the necessary steps to repair the objects and bring the VMs back into compliance.