We are running vSphere 5.1 using NFS datastores on NetApp. On Saturday, we removed/deleted a 150GB disk (thin provisioned) from one of our VMs. We backed up all the data on the disk -- about 100 GB. We took notes before and after the move.
The datastore volume has 540 GB capacity.
Provisioned space before deletion: 594 GB. After deletion, 436 GB.
Free space before deletion: 232 GB. After deletion, 235 GB.
I always thought that with NFS datastrores, space reclamation was done automatically. Why are we not seeing the free space go up?