Determine Size of Replication Delta's (checkpoints)

Hello,

I am currently replicating between 2 VNX2 5400's.

I have been asked to determine what our bandwidth usage is between these 2 VNX's.

Is there any way to tell how much delta data is transferring from one to another?

Currently my file systems are set at 10 minutes out of sync, so I am assuming that every 10 minutes it syncs changes.

It is these changes I am trying to find the data.

I hope this makes sense.  Maybe if I could just find how much data is transferred in a certain period, that would help also.

Thanks everyone for your time.

Brandon