Best practises for increasing the troughput rate

[forumuser]

Dear everyone,

I am trying to understand how I can double the throughput of Veeam back-up when adding a second network adapter.
With one gigabit ethernet connection we get like 60-80MB/s troughput. Adding another networkadapter just increases this like 10-20%

-We have jumbo frames enabled
-We have multipathing configured (via VMware and in-guest)
-I tested round robin in VMware with iops=1
-Parallel job processing enabled

How can I literally double the speed by adding the double amount of network adapters?
-Why is: ESXi (local storage) - 2x gbit in multipathing -> Dell Compellent with 25 disks in RAID 10+ RAID6 snapshotting= 2048/8= not even near 256 MB/s but more like 90-100MB/s in a PoC?

And am I correct about the following:
We configure 64k blocksize in ReFS. But our Synology has a stripe size of 256 and it's in RAID6 modus.
256/64=4x write speed gain /6(=raid 6 penalty) makes the performance equal to 0,66 Seagate disk while there are 9 data disks installed?

I can't find the bottleneck.

Please share any real world exprience in increasing the throughput of Veeam.

Thank you.
Mark

[dimaslan]

+1 from me, we are interested in this as well.