Use the data migration pre-check to determine the impact of data migration options when unmounting a disk or disk group, or removing it from the vSAN cluster.
Run the data migration pre-check before you unmount or remove a disk or disk group from the vSAN cluster. The test results provide information to help you determine the impact to cluster capacity, predicted health checks, and any objects that will go out of compliance. If the operation will not succeed, pre-check provides information about what resources are needed.
Procedure
What to do next
If the pre-check indicates that you can unmount or remove the device, click the option to continue the operation.