2011-11-07 07:21 AM
No, i don't think so, because the filer doesn't even know that esx has deleted the files on the datastore.
On most file systems(NTFS, FAT, ...), a delete operations just deletes the pointer in the inode-/fat-table, but not the data blocks. That's the reason why you need the space reclaimer to clear those data blocks (not in realtime) and report them to WAFL.
2011-11-07 07:44 AM
If your DS is empty and you need the space back, you could simply recreate it (destroy/provision).
Have you considered using NFS? It vastly simplifies many of these issues.
If you do not have the VSC (Virtual Storage Console) grab it off of the NOW site and install. It will help with the management of your virtual storage.