I think the above was not clear to me as I thought that once you provision a VM with a vdisk of a certain amount (what ever disk format) - no activities (temporary or not) would be able to consume more than that on the datastore.
That's unfortunately not the case. As mentioned, each snapshot may grow up to the virtual disk's provisioned size, which can already cause issues, and using thin provisioning for virtual disks is one more reason, why it's important to monitor disk space usage on a datastore.
André
