Linux Hint published a tutorial about setting up a Synology NAS as VMware Datastore.
How to Setup Synology NAS as VMware Datastore
You can mount your Synology NAS shared folders on your VMware ESXi servers. Once you’ve mounted a Synology NAS shared folder on your VMware ESXi server, you can use it as a VMware datastore. You can also store virtual machine data on that datastore as usual. How to Setup Synology NAS as VMware Datastore is explained in this article.
