Best way I can think of ,though,potentially async sm may have a higher change rate dependent on work load and current sm schedule.

For example, a block might change once every 5 seconds but snapmirror once every hr will only catch 1 block change every hour.

On Mon, Jan 14, 2019 at 10:40 AM Basil basilberntsen@gmail.com wrote:

I use an older version of ontap (9.1) with the old fashioned snapmirror (DP, not XDP), but basically the estimate should be based on the cumulative snapshot delta, minus potential compression.

Snapshot show-delta is the command to see the delta between any two snapshots.

On Mon, Jan 14, 2019 at 9:27 AM Mike Michalakis mike@directit.com.cy wrote:

...

I’m wondering how anyone approaches the following scenario:

We have an existing NetApp system in place (ONTAP 9.4), currently taking Snapshots of all the required volumes as per the required RPO objectives as defined.

The question is:

There is now a requirement to implement a DR site using Asynchronous Snapmirror, based on the current snapshots and rate of change, what is an estimated bandwidth requirement to meet X RPO.

What tools or options are available for completing such an exercise or the methodology

Thanks

MikeM _______________________________________________ Toasters mailing list Toasters@teaparty.net http://www.teaparty.net/mailman/listinfo/toasters

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