VMware VS4-ENT-PL-A Setup Guide - Page 53
Multiple Single Sign-On, instances in the same, location, instances in different - replication
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Chapter 3 Before You Install vCenter Server Multiple Single Sign-On instances in the same location Multiple Single Sign-On instances in different locations In Basic deployment mode, a single standalone instance of the vCenter Single Sign-On server supports the connectivity of Active Directory, OpenLDAP, Local Operating System, and vCenter Single Sign-On embedded users and groups. In most cases, the vCenter Single Sign-On instance is installed on the same host machine as vCenter Server, as with the vCenter Server Simple Install option, or the vCenter Server Appliance. The Basic vCenter Single Sign-On deployment is appropriate in the following circumstances: n If you have a single vCenter Server of any supported inventory size: up to 1,000 hosts or 10,000 virtual machines. n If you have multiple geographically dispersed locations, each with a local vCenter Server and you do not require a single-pane-of-glass view as provided by vCenter Linked Mode. For this deployment mode, you install a vCenter Single Sign-On primary instance and one or more additional vCenter Single Sign-On nodes. Both the primary and high availability instances are placed behind a third-party network load balancer (for example, Apache HTTPD or vCNS). Each vCenter Single Sign-On has its own VMware Directory Service that replicates information with other vCenter Single Sign-On servers. vCenter Single SignOn administrator users, when connected to vCenter Server through the vSphere Web Client, will see the primary vCenter Single Sign-On instance. This deployment mode has the following limitations: n It provides provides failover only for the vCenter Single Sign-On service. It does not provide failover for the vCenter Single Sign-On host machine and it does not load balance requests between vCenter Single Sign-On nodes. 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. See "vCenter Single Sign-On and High Availability," on page 54 for high availability options. This mode is designed for vCenter Server deployments with multiple physical locations. Multisite deployment is required when a single administrator needs to administer vCenter Server instances that are deployed on geographically dispersed sites in Linked Mode. VMware, Inc. 53