I am starting this discussion because I need to calculate Volume Sizing to avoid aggregate running out of disk spaces leading to LUN being offline, however, I find that my 16 TB aggregate after Volume and LUN assignment, is using only 208 GB used spaces and lots of free spaces left !!!!!!!!!!!!!
My 16 TB Aggregate has 3 Volumes as below:-
1st Volume 14 TB with 1 x 13 TB LUN with Space Reservation 2nd Volume 1.1 TB with 1 x 1 TB LUN with Space Reservation 3rd Volume 1 GB used by root
I have the 1st Volume above with Storage Efficiency Dedup and Compression scheduled running at midnight that has shown saving over 200 GB of disk spaces.
The 1st Volume holds a 13 TB LUN which is a vmware vmdk disk.
When I check the 13 TB LUN from its vmware client GUI, the Capacity shows that 10 TB has been used and only 3 TB left.
However, from the NetApp GUI, it shows that the 13 TB LUN only has 2.5% used, therefore, how can that be possible even with Dedup and Compression turned on that has only saved 223.5 GB ????
All my Volumes will NOT be using any snapshot, backup technology, snapmirror...etc that creates snapshot, however, I am using Storage Efficiency Dedup and Compression scheduled running at midnight, would it lead to temporary snapshot being generated in the process and I need to reserve spaces for snapshot ????????