/opt/vmware/vcloud-director/data/transfer ) consumption from VMware Cloud Director is using almost all of the space available.VMware Cloud Director 10.x
This is issue occurs when the feature "Enable early catalog export to optimize synchronization" for a catalog is enabled. When published it causes VMware Cloud Director to keep folders which contains files (such as vmdks) instead of automatically removing the folder.
If the feature "Enable early catalog export to optimize synchronization" is required to publish a catalog you will need to add extra storage space to store the published catalog at the Transfer Server storage location (NFS share).
See the following document to Publish a Catalog in the VMware Cloud Director Tenant Portal.