Just a basic quick question I’d like confirmation on if possible. In a Nutanix Metro availability configuration (ESXi stretched cluster stretched across two sites) do all the CVM’S from both clusters have to be on the same Layer 2 Network to be supported?
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Metro Availability - CVM's in the same layer 2 network?
+1Best answer by Moustafa Hindawi
Hello Algon
Most Metro Availability configurations assume a layer 2 network across the two sites, but layer 2 is not a requirement.
- Layer 3 is sufficient to enable Metro Availability, VMware vMotion, and VMware HA restart capabilities. For example, the Nutanix nodes in site 1 could be on network 192.168.10.0/24, while the Nutanix nodes in site 2 could be on 172.16.10.0/24.
- Layer 2 helps enable seamless network failover for VMs with static assignments.
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+6Hello Algon
Most Metro Availability configurations assume a layer 2 network across the two sites, but layer 2 is not a requirement.
- Layer 3 is sufficient to enable Metro Availability, VMware vMotion, and VMware HA restart capabilities. For example, the Nutanix nodes in site 1 could be on network 192.168.10.0/24, while the Nutanix nodes in site 2 could be on 172.16.10.0/24.
- Layer 2 helps enable seamless network failover for VMs with static assignments.
+10Correct
But always keep in mind that latency is the most critical factor when doing Metro, IO-commit is received when both sites have written to disk.
So the latency between the two clusters is key and will be better if there is no routing necessary.
We always advice our customers to go with streched L2 for the best performance
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