VirtuCache doesn’t support Write-Back caching for a cluster with mixed ESXi 6.x and 7.x hosts

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Because VirtuCache uses different APIs for ESXi 6.x and 7.x, VirtuCache cannot establish peer connections between hosts that are on ESXi 6.x and 7.x, as a result, VirtuCache cannot replicate (mirror) the write cache between hosts that are on ESXi 6.x and 7.x, and so VirtuCache’s ‘Write-Back 1 Replica’ policy will not work in a cluster that has mixed 6.x and 7.x hosts.
This constraint doesn’t apply to dot releases within ESXi 6 or ESXi 7 i.e VirtuCache fully supports all features if the ESXi cluster has hosts on different versions of ESXi 6.x in the same cluster.

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