Hyper-v ISCSI Cleanup

[nitrobass24]

I have an interesting problem, the disk space started to fill up over 75% on one of my LUNs so i went through and deleted checkpoints, compacted VHDs, etc.

Now if I go onto my host and get the file size of my VMs it totals about 120GB. However, on my Diskstation, the LUN is showing its over 200GB.

Why is this diskspace not being reclaimed?

 

[bmh.01]

Thin provisioned lun I assume? The diskstation doesn't know the space has been released, only the ntfs volume is aware.

Google thin provisioning unmap will explain better than I can. On esxi I'd just run an unmap command I assume the same can be done with hyper-v.