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NetApp Sizing

Storage

Byte.com

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.


   Select Shelf  Shelf Qty  Drive Type  Drive Qty  Raw Single Drive Size GB  Right Sized Drive GB  Raw Disk Total TB  Right Sized Disk total TB  Drive Slots Avail  Rack Space
 Shelf_Type_1                
 Shelf_Type_2                
 Shelf_Type_3                
 Shelf_Type_4                
 Shelf_Type_5                
 Shelf_Type_6                

 Rack Space  
 Drive Totals  
 Total Raw TB  
 Total Right Sized TB  

(reset will clear all data above)

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.

   Drives Used from Shelf  RAID Type  Aggr0  Disks in Aggregate  Parity Drive  Spare Disk  Right Sized Disk  Drives Available  WAFL Reserve 10% in GB  Aggr SnapShop Reserve 5% in GB  Core Dump Reserve Space 1% in GB  Total Usable Space in TB
 FAS_Head_A                    
 FAS_Head_B                    

(reset will clear all data above)

Now that Aggr0 has been created for a place to put the operating system you can carve up the rest of the disk below.

   Drives Available  RAID Type  Number of Aggregates  Disks in Aggregate  Parity Drives  Spare Disk  Right Sized Disk  Drives Left  WAFL Reserve 10% in GB  Aggr SnapShop Reserve 5% in GB  Total Usable Space in TB
 Shelf_Type_1                    
 Shelf_Type_2                    
 Shelf_Type_3                    
 Shelf_Type_4                    
 Shelf_Type_5                    
 Shelf_Type_6                    

Now that the aggregates have been calculated you may now take a look at what you would be doing with the disk. Here you will enter the amount that would be LUN based data. There is a miniscule hit for LUN based data and I have calculated it here at .01%.

   Percentage Used for LUN  Disk Available for LUNs  LUN Overhead  Total Block Usable TB  Total File Usable TB
 FAS Head A Aggr0  %        
 FAS Head B Aggr0  %        
 Shelf Type 1  %        
 Shelf Type 2  %        
 Shelf Type 3  %        
 Shelf Type 4  %        
 Shelf Type 5  %        
 Shelf Type 6  %        

(reset will clear all data above)

The final calculations based on the information that was entered is as follows:

   Disk Usable
 FAS Head A Aggr0 Usable:  TB
 FAS Head B Aggr0 Usable:  TB
 Total Disk vice Aggr0:  TB
 Total Disk:  TB
 Block Disk Total:  TB
 File Disk Total:  TB