On another instance of HammerDB select Replica Mode, enter the id and hostname of the Primary and select OK.

Figure 8.7. Replica Mode

Confirm the change and observe the Mode connection on both the Replica

Setting Replica Mode at id : 23096, hostname : raven
Replica connecting to raven 19280 : Connection succeeded
Primary call back successful

and the Primary. There is no restriction on the number of Replicas that can be connected to one Primary.

Received a new replica connection from host fe80::a3b7:309e:a58d:3658%11
New replica joined : {23096 raven}