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High availability for data via clustering is discussed later, but le server clusters are fully supported, allowing data to be stored on external storage including a SAN with multiple servers servicing the storage With multiple servers serving the storage, a single server outage does not interrupt access to data However, that is just one method of making data highly available Clusters do not assist in distributed environments where users travel between of ces that might have copies of the same data Ideally, as a user travels, he accesses the nearest copy of data Additionally, the number of le servers is increasing in many environments, so knowing which server to go to for a share or which mapped drive to use is problematic for the user DFS uses a namespace that is stored as part of the domain consisting of links that are logical names having one or more link targets that point to a share on a le server This allows the user to see a single share, which is the actual DFS namespace When the user navigates through the various links of the DFS, which appear simply as folders, the user is redirected to the closest le server that contains the data without even knowing it, as shown in Figure 1-6 In the example, the user is accessing the Sales folder of the DFS and is redirected to the share Sales on the Fileserver2 server If the user accessed Documents, he could be redirected to either of the copies or, if spread geographically, to the closest version In addition to the namespace, a sophisticated delta-based replication engine keeps multiple copies of the same share synchronized This is a big improvement over the FRS present in Windows 2000 and Windows 2003 In our example, the replication keeps the two copies of the Documents share synchronized
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FIGURE 1-6 Although DFS can have link targets to shares on hundreds of servers, in this example, the domain-based DFS named Shared in the savilltechcom domain has links to just two le servers with different shared folder names, but each holds a copy of Documents and the DFS namespace points to both In addition to safe and easy data storage and access, users want their data restored when they lose it Windows uses the VSS for backups and to provide Shadow Copy Restore (also known as Previous Versions), which allows a user to right-click a le or folder and see previous versions of the data at points in the past This functionality allows users to restore their own data, cutting the need for administrator intervention In Windows Vista, this is also available on the clients local disks! Users also want an easy way to nd their data Windows Server has a content indexer component that indexes the information on the le server and gives easy access to query the index via the users local Search option from the Start menu
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File storage is great but sometimes a greater collaboration environment is required, for example, the ability to check out les for editing and then check them back in, and combine the data with calendaring, contacts, list data, and the other components required for full collaboration and project success Microsoft provides Windows SharePoint Services (WSS) to supply a Web-based environment to facilitate end user collaboration Windows Server 2008 delivers everything needed for your Windows infrastructure, and for interoperation with other environments such as NetWare and UNIX via both platform-speci c solutions and network standards such as the Network File System (NFS)
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Despite drives to a paperless environment and more online collaboration, the requirement to print data still exists Although it is possible to connect printers to each user s workstation, it is not ef cient Even though many printers connect directly to the network, it is not desirable for each client to connect directly to a network printer The Windows Server platform provides printer-sharing capabilities and print job queuing (a print job is simply a set of data to print), which allows prioritization of printing and limits maximum print job size at certain times of the day Additionally, to simplify driver management when a client connects to a printer via a Windows print server, the server sends the locally needed driver to the client machine for installation, minimizing the actions needed to set up the client to be able to print With Windows Vista and Windows Server 2008, clients can fully render print jobs before sending them to the print server to cut down on the workload of the print server, which increases the availability of the print server There have always been discussions regarding the best placement of a print server in distributed environments Obviously the physical printer has to exist in the remote location so that the users can pick up the print job Placing a print server locally increases management tasks, such as updating drivers But not placing a local print server means a job has to be sent over the WAN to the print server and then back over the WAN to the actual printer With Windows Server 2008, the Print Management Console gives a central control point and allows printer driver deployment and updates to multiple print servers It includes automatic printer discovery on the server, which is useful because it enables a subnet to be speci ed and any printers in the subnet to be found and con gured with a print queue on the print server
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