This tool was created to aid in finding NetApp usable disk space and is not sanctioned by NetApp Corporation. The tool is broken down into three sections. The first section goes through the physical shelves and drives and will give you the starting numbers to work from. Then you can move on to setting up Aggr0. This is the first aggregate that is setup and where DataOntap will be installed. You can also setup more aggregates with the available disk drives within the shelves you have entered to get a better picture of a real number of total usable disk space that is available. The third section lets you select a percentage based on file (CIFS/NFS) or LUN (iSCSI/FC) usage. There is a penalty (however minute) for creating LUNs on a filer. Any column with a gold backbround will accept user data.
To clarify my terminology on what I called "Right Sized" is typically a 2% overhead based on different disk geometry (this is across the storage industry) as each manufacturer creates their disk devices differently. Now I did take the liberty of including the zeroing of the disks also within this variable. There is 0% zero'd overhead for FC or SAS drives (520K bytes per sector) and 10% zero'd overhead for SATA dives (512K bytes per sector ) and was also included in the right sized numbers. You will also notice that I have added the drive slots available column. As you add drives it will automatically deduct from the available slots.
Now that everything has been entered above the next step is to setup aggregates using the shelf/disk selections made above. This is more of an art then a science but it will give a better picture as to the real usage of the disk. I have made the tool to be compliant with DataOnttap 7mode and not DataOnTap c-mode as of yet. Start entering the base design for Aggr0. Normally you would add 3 drives to "Disks in Aggregate" set it up as a RAID-DP and give it 1 spare drive per FAS head.
Now that Aggr0 has been created for a place to put the operating system you can carve up the rest of the disk below.
The final calculations based on the information that was entered is as follows: