topic Re: OSS Bandwith Calculation in ONTAP Discussions

OSS Bandwith Calculation

clamparth — Thu, 05 Jun 2025 07:03:51 GMT

Is there a seizing tool for the bandwith required if we use OSSV to backup file server data over the WAN? We currently have 1.5TB with a daily change rate of 5-7GB.

Thanks

Re: OSS Bandwith Calculation

reide — Wed, 12 Jan 2011 00:31:09 GMT

Yes. It's called a calculator. In all seriousness, your assigned NetApp Systems Engineer should have access to a utility called "Quick Bandwidth Wizard" in his Synergy 3.0 tool. This individual can assist you. In the meantime, you can take a swag at this calculation:

( 7 GB of changed blocks / 8 hour backup window ) = 917.5 MB/hr / 60 minutes = 15.3 MB/minute / 60 seconds = 254.8 KB/sec. So you would need a WAN link capable of sustaining 255 Kilobytes (2040 kilobits) per second for 8 hours. So if your backup window was only 8 hours, a T1 link capable of 1.544 megabits per second ( 193 Kilobytes per sec) wouldn't quite cut it.

Here is a handy tool you can use to determine the type of WAN link you'd need.

http://www.ibeast.com/content/tools/band-calc.asp

Re: OSS Bandwith Calculation

reide — Wed, 12 Jan 2011 01:51:54 GMT

I forgot to mention that the Synergy 3.0 bandwidth wizard also factors-in things like WAN latency, packet size and packet loss so it is much more accurate than my example above.

Re: OSS Bandwith Calculation

clamparth — Wed, 12 Jan 2011 17:51:11 GMT

Hi Reide

Yup that helpded thank you for the answer.