Ok - just to bring you up to speed: 3rd time writing this post - 3rd times the charm. I've replaced both Cat5e cables with Cat7e's, direct connection to both servers using a 10GB NIC for CSV Sync, and another for the Heartbeat, and I'm now seeing a Transfer Rate of around 6.5GBps. It currently takes...

Ok I'll check the storage out.
We've been using RAID5 for a while (Not seen any performance issues with backing up/restoring). We've had to squeeze as much storage out of it as possible hence the RAID5, and because we can't afford to jump over to SSD's just yet.

Morning! So this weekend I've tried to setup a 2-node Cluster on-site, using Starwind VSAN, in Server 2016 Datacenter. I've created a HA Device between my two nodes which is 5.5TB (I'm using it to host several VM storage), and once the device is created, the sync is...slow. The most I've seen it top...