Question on Thick Provisioned LUN:
1) After deleting 50GB from host side how much data can I put again, 50GB or 100GB, if I am not deleting the snapshot on storage?
You can put 100GB of data on your 100GB thick Lun. You can create additional 100GB Lun in your 200GB Volume, but there will not be space for snapshots.
2) Do I need to create volume double the size of LUN to utilize the full capacity of the LUN as same size of space would be used by snapshot?
No, you don't need. Percent of free space at volume depends by your snapshot policy, data changerate etc. In my practice there are around 20% of volume, when snapshot technology used. By the way you can setup snapshot autodelete policies, when (for example) volume space near 5%.
