I have resolved it. I have smelled something fishy with the Mellanox cards, so I started investigating the parameters and drivers. As it turned out, on one server the Mellanox driver was 5.3, on the other one 5.1. That caused some kind of comm problems I suppose and could not sync. I have pulled up ...

One more detail, the 10Gb links are on Mellanox cards, I was wondering if some config parameters have to be tuned. (Jumbo frames are already set)

Dear Boris, Unfortunately it did not help. I have changed the value: 10/16 1:22:34.676 31c8 conf: 'WUSCEnabled' = 'yes' 10/16 1:22:34.676 31c8 conf: 'SrvWasDisabled' = 'no' 10/16 1:22:34.676 31c8 conf: 'SrvRestoreStartType' = '2' 10/16 1:22:34.676 31c8 conf: 'VaaiExCopyEnabled' = 'yes' 10/16 1:22:34...

Hi Oleg, The 2x10Gb NICs are not teamed, I planned to use them for failover MPIO configuration for sync. Previously I have tried configuring sync and heartbeat on the 10Gb NICs, also tried heartbeat on 1Gb and sync on 10Gb, but the 10Gb always threw a connection error. The subnet of the 10Gb NICs ar...

Greetings, I have a 2 node hyper-converged Hyper-v setup with 4x1 Gb NICs and 2x10 Gb NICs. The 10Gb NICs are connected to a dedicated switch and running on 192.168.1.0/24 subnet. The other NICs are on 10.42.30.0/24 and 10.42.31.0/24. If I configure the heartbeat and sync on the 1Gb NICs, everything...