FS S5850 - 7 nodes lots and continuous "slow OSD heartbeats"

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Hi,

We are in the process of using for production a 7 host reef ( 18.2.2) cluster 
and we noticed lots and continuous "slow OSD heartbeats"
although there is no clients, no data and the nodes are using 2 x 25GB for Frontend and 2 x 100GB for backend

The logical culprits is the network 
we have 2 x S5850 with  MLAG and LACP

I was wondering if any of you are familiar with FS and can provide some guidance as to how to properly configured ( or troubleshoot)

Note
We are  running in a air gapped environment so cannot provide outputs/config 
but here are some pictures 

Many thanks
Steven
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