I am having some issues converting a disks from thick format to thin format. We have just upgraded to vpshere and we have some few VM's which are not fully utilising their disk space. So i used the migration wizard to convert the disks to thin, but in the datastore they are still allocating the same amount of space. We have an IBM DS4500 fibre SAN where all our datastores are based.
For example, I have a VM which has 2 disks, with disk 1 having 15 GB, but has free space 10GB, and disk 2 which has disk space 30 GB and has free space 25 GB. I used the migration tool to convert these disks to thin, and it completed successfully. When I look at the disk settings of this VM it shows the disk format as Thin. But when I look at the datastore where the disk is stored it shows still as 45 GB being used and also in the summary page of the VM it shows the provisioned storage, not shared storage and used storage as 45 GB. So it seems to be incorrect. Have I missed a step or something, as I thought thin provisioning would reduce space on the datastore. I have also restarted the VM.
Any ideas, Thanks
