VMware VS4-ENT-PL-A Setup Guide - Page 54
vCenter Single Sign-On and High Availability
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vSphere Installation and Setup Each site is represented by one vCenter Single Sign-On instance, with one vCenter Single Sign-On server, or a high-availability cluster. The vCenter Single Sign-On site entry point is the machine that other sites communicate with. This is the only machine that needs to be visible from the other sites. In a clustered deployment, the entry point of the site is the machine where the load balancer is installed. NOTE This deployment mode is required if you have geographically dispersed vCenter Servers in Linked Mode. You might also consider this mode in the following cases: n If multiple vCenter Servers require the ability to communicate with each other. n If you require one vCenter Single Sign-On server security domain for your organization. This deployment mode has the following limitations: n It supports the connectivity of Active Directory, OpenLDAP and vCenter Single Sign-On embedded users and groups, but does not support the use of local operating system user accounts. n Secondary vCenter Single Sign-On instances must belong to the same Active Directory or OpenLDAP domain as the primary vCenter Single Sign-On server and must have a local domain controller available. You can install the vCenter Single Sign-On nodes in this deployment in any order. Any node that is installed after the first node can point to any node that is already installed. For example, the third node can point to either the first or second node. vCenter Single Sign-On and High Availability vSphere provides several ways to ensure availability of your vSphere deployment with vCenter Single SignOn. vCenter Single Sign-On is merely an authentication component for vCenter Server. Single Sign-On protection does not provide any benefit without vCenter Server protection. Protecting one without the other does not provide an effective availability solution. The solution you choose to protect vCenter Server will provide the same protection for vCenter Single Sign-On without the additional complexity caused by including third-party technologies. 54 VMware, Inc.