We're here to help, 24x7

How much bandwidth is needed for each storage performance tier?

by Community Manager ‎25-05-2017 06:33 PM - edited ‎06-06-2017 04:14 PM

There are a number of factors that influence this. To estimate the bandwidth, we can provide you with some guidance based on a typical 8 kilobyte (KB) block, which is the most common size NetApp® customers use. Of course, this is our guidance and not an exact figure. You can change this figure depending on the application(s) you use.


The formula we use is:


((IOPs* x 8KB block)/1024 bytes) x 8 bits = bandwidth required per second per terabyte (TB)


*IOPs are inputs/outputs per second


For example, for the Ultra tier:


((4000 IOPs x 8KB block)/1024 bytes) x 8 bits = 250Mbps per TB


Typically, you wouldn’t use 100% of your storage at once; so assuming you’d use 10% at any given time:


250Mbps/10% concurrency = 25Mbps per TB


Estimated network bandwidth required with 8KB block


Storage tier IOPs /TB provisioned 100% usage 10% concurrent usage


4000 IOPs/TB

250Mbps per TB

25Mbps per TB


2000 IOPs/TB

125Mbps per TB

12.5Mbps per TB



 8Mbps per TB

0.8Mbps per TB




0.2Mbps per TB


Still have questions?


The Storage Networking Industry Association’s guidelines on workload design might help you further.


To discuss more about your storage performance needs, contact your Telstra representative or contact us.