How to Determine the Amount of TCP Sessions Zerto Creates for Replication
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For network load/security reasons, an Administrator would want to know how many TCP connections the VRA creates during its replication process.
Here are all VRA connections it creates during the replication process:
ZVM -> VRA control - 1
ZVM -> VRA checkpoints - 1
The VRA -> VRA connections are a full graph – all are connected to all.
For each pair of VRAs:
VRA1 -> VRA2 control - 1
VRA2 -> VRA1 control - 1
If there's a replicating volume between VRA1 -> VRA2 then will be also 8 data sockets (another 8 if there's also replication between VRA2 -> VRA1).
So the formula is:
Number of VRAs - N
Number of pairs - P (=N*(N-1)/2)
Number of replicating pairs - R (R<=P*2)
Number of TCP connections = 2N+2P+8R
Where 2N are connections inside the LAN and 2P+8R are over WAN.