In the Part 1 of this series, I was writing about the most common cases which might prevent a successful migration to VMFS-6. There is another one to cover.

For ESXi hosts that boot from a flash storage or from memory, a diagnostic core dump file can also be placed on a shared datastore. You won’t be able to un-mount this datastore without deleting a core dump first.

VMware recommends using an esxcli utility to view/edit the core dump settings. This also can be automated via PowerCLI.

To check if the core dump file exists and is active, please use the following code:

To delete an old configuration that points to the VMFS-5 datastore, the following script can help:

With this change made you would be able to continue migrating to VMFS-6 without any issue.

If you have any suggestions or concerns, feel free to share them in the comments below.