Space reclaim for lun



I have some iscsi lun configured on a 9.1P10 cluster.

space-allocation option is disabled, so I'm guessing I'm wasting disk space without reclaiming space.

Ontap 9 documentation says

"If you set the space-allocation option to enabled, Data ONTAP notifies the host when the volume has run out of space and the LUN in the volume cannot accept writes. This option also enables Data ONTAP to reclaim space automatically when your host deletes data."

Can I use snapdrive to reclaim space one shot?

Can I use a windows host to reclaim space on lun mapped for both windows and linux clients?

Do will be a disruptive operation?

Thank you