Connection Server instances in a pod federation use the Global Data Layer to share key data. Shared data includes information about the pod federation topology, user and group entitlements, policies, and other Cloud Pod Architecture configuration information.
In a Cloud Pod Architecture environment, shared data is replicated on every Connection Server instance in a pod federation. Entitlement and topology configuration information stored in the Global Data Layer determines where and how desktops are allocated across the pod federation.
Horizon 8 sets up the Global Data Layer on each Connection Server instance in a pod federation when you initialize the Cloud Pod Architecture feature.
Concretely, the Global Data Layer is a second LDAP instance that runs alongside each Connection Server instance's existing local LDAP instance. The two LDAP instances serve different purposes: the local instance continues to hold pod-specific configuration, while the Global Data Layer instance holds only the data that must be identical everywhere — global entitlements, sites, home sites, federation access groups, and related policies. Because every Connection Server instance in the federation replicates this second instance with every other Connection Server instance, any pod can answer entitlement and topology questions correctly even if the pod that actually hosts a given resource is temporarily unreachable. Global Data Layer replication uses TCP port 22389.
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