We have many configured iSCSI and FC lun's, mostly used with windows servers. by removing files or directory's in windows no disk space gets freed up.
I tried goggling this issue and it appears that blocks are freed but the storage doesn't know about this, causing to never get back the free blocks (disk space), I also found in one of the forums talking about something called "iSCSI unmap" which apparently fixes this issue.
Question: Is this a known issue? What can we do not to run to this issue? or will this issue be addressed at a latter update?