Considerations for Enterprise Technologies 2-13Considerations for Enterprise TechnologiesLarge organizations, or organizations with specialized requirements for security, reliability, or remoteaccess frequently employ technologies that impact the installation process. This section briefly describestwo technologies that CentreWare printer drivers support—clusters and Citrix MetaFrame—and the roleof the Add Printer Driver Wizard in preparing these environments for successful printer definition.ClusteringClustering is a technology that configures two or more servers ("nodes") to behave as one, from a userperspective. Each node has access to a storage medium (the "cluster") that houses the supportedapplication or data.Clustering is usually employed to improve fault tolerance or to implement load balancing. Typicalapplications of clustering are applications or functions that require virtually uninterrupted service, suchas production report generation in many manufacturing environments, where one server failure couldhave repercussions throughout the supply chain.Print servers are one of many possible applications of clustering. Others include Web services, ftpservices, file management, and even managing some aspects of Active Directory.When a cluster houses a print server, only the print spooler folder resides on the cluster. The printerdrivers reside on the nodes in their standard locations. When one node fails, printing continues using thedrivers that are present on a surviving node. Should that node lack the appropriate drivers, consequencesrange from a lack of access to advanced driver features to a complete inability to print.To ensure consistent printer availability in a cluster, use the Add Printer Driver Wizard (see Add PrinterDriver Wizard on page 2-14) to install the same printer drivers on all nodes in a cluster before adding theprinter to the cluster itself.Citrix MetaFrameCitrix MetaFrame provides centralized application management and distribution to an enterprise.Applications that are published to users from a Citrix server have a single point of installation andmaintenance, simplifying administration. Desktop hosting capabilities offer access to current operatingplatforms and applications to users running a wide range of hardware and operating systems, whileproviding administrators increased control.A Citrix server can be configured to "auto-create" a printer or printers when a Windows client logs in.This procedure makes the client’s Windows printers available within a Citrix session. If the appropriatedrivers do not reside on the Citrix server, the Citrix server substitutes a "universal" driver. The user canstill print, but many of the features associated with CentreWare printer drivers, such as accounting orbooklet creation, are unavailable.To prevent this, install the CentreWare drivers (See Add Printer Driver Wizard on page 2-14) on a Citrixserver (or on all members of a Citrix server farm) before clients that use local printers based on thesedrivers log in.N OTE : Xerox recommends this practice even on the Windows Server 2003 cluster managementproducts that have an "Automatic Quorum Feature." This is to ensure that damaged or corrupt driverfiles are not passed from one node to another should failover occur.