Why not cluster in ArcGIS Enterprise 10.5.1?

[Juan_ManuelAngel]

Good morning, it is possible that somebody will answer me technically because in ArcGIS Enterprise 10.5.1 version it is not recommended to develop cluster as it says in a document that was published of UC 2017 of the architecture of ArcGIS Enterprise, Thank you very much.

[JonathanQuinn]

In many environments, clusters have caused too much inter-machine communication which made the deployment unreliable and under-performing.  The recommendation is to have a single cluster, (which is the default for new deployments at 10.4).  If you need clusters to separate workloads for certain machines, separate sites should be used.