Additional information:
Problem:
Performance around 6Mbits on Intel X710/XL710/X722 SFP 10Gbps NICs (tested with bond LACP - which is not advised in JovianDSS, tested with MPIO).
Symptoms:
Below error visible in the JovianDSS LOGS - kernel-sys.log: Jun 7 15:30:38 [kern.err] [ 32.372709] Non-contiguous TC - Disabling DCB
Solution:
Disable DCB/DCBX for all X710/XL710/X722 NICs on the server/hardware side (BIOS/management).