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In a NAS, server-storage communications are on the LAN.
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A SAN is physically separate from the LAN and is independently managed. As shown in Figure 19-2, this isolates the server-to-storage communications so that traffic doesn t impact communications between clients and servers. Several SAN technologies are implemented, including fibre channel, a more traditional SAN technology that delivers high reliability and performance, and Internet SCSI (iSCSI), a newer SAN technology that delivers good reliability and performance at a lower cost than fibre channel. As the name implies, Internet SCSI uses TCP/IP networking technologies on the SAN, allowing servers to communicate with storage devices using the IP protocol. The SAN is still isolated from the organization s LAN.
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Part 5: Managing Windows Server 2003 Storage and File Systems
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Figure 19-2. In a SAN, server-storage communications don t affect communications between clients and servers.
Improving Storage Management
Because of the increasing use of SANs, Windows Server 2003 includes many new and enhanced features for working with SANs and handling storage management in general. These improvements include the following:
Volume Shadow Copy service (VSS)
VSS allows administrators to create point-intime copies of volumes and individual files called snapshots. This makes it possible to back up these items while files are open and applications are running and to restore them to a specific point in time. VSS also makes it possible to create point-in-time copies of documents on shared folders called shadow copies.
Note
Users can recover their own files when VSS is enabled. Once you configure shadow copy, point-in-time backups of documents contained in the designated shared folders are created automatically, and users can quickly recover files that have been deleted or unintentionally altered as long as the Shadow Copy Client has been installed on their computer. For more information about VSS and the Shadow Copy Client, see 22, Using Volume Shadow Copy. Virtual Disk Service (VDS)
VDS makes it possible for storage devices from multiple vendors to interoperate. To do this, VDS provides application programming interfaces (APIs) that management tools and storage hardware can use, allowing for a unified interface for managing storage devices from multiple vendors and making it easier for administrators to manage a mixed-storage environment.
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Part 5: Managing Windows Server 2003 Storage and File Systems
Microsoft Windows Server 2003 Inside Out
Volume automounting
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Volume automounting makes it possible to manage better the way volumes are mounted. By using the MOUNTVOL command, administrators can turn off volume automounting. By using volume mount points, administrators can mount volumes to empty NTFS folders, giving the volumes a drive path rather than a drive letter. This means it is easier to mount and unmount volumes, particularly with SANs. Multipath I/O makes it possible to configure as many as 32 separate physical paths to external storage devices that can be used simultaneously and load balanced if necessary. The purpose of having multiple paths is to have redundancy and possibly increased throughput. If you have multiple host bus adapters as well, you improve the chances of recovery from a path failure. However, if a path failure occurs, there might be a short period of time when the drives on the SAN aren t accessible. DFS makes it possible to create a single directory tree that includes multiple file servers and their file shares. The DFS tree can contain more than 5000 shared folders in a domain environment (or 50,000 shared folders on a stand-alone server), located on different servers, allowing users to find files or folders distributed across the enterprise easily. DFS directory trees can also be published in the Active Directory directory service so that they are easy to search.
Multipath I/O
Distributed File System (DFS)
Tip DFS now supports multiple roots and closest-site selection New for Windows Server 2003 is the capability for a single server to host multiple DFS roots and use closest-site selection. The capability to host multiple DFS roots allows you to consolidate and reduce the number of servers needed to maintain DFS. By using closestsite selection, DFS uses Active Directory site metrics to route a client to the closest available file server.
File Replication Services (FRS)
FRS makes it possible to synchronize data across the enterprise and is in fact the synchronization technology used by Active Directory. FRS works in conjunction with DFS to replicate data on file shares and automatically maintain synchronization of copies on multiple servers. New for Windows Server 2003 is the DFS Microsoft Management Console (MMC), which allows administrators to configure replication. FRS is now capable of compressing replication traffic as well.
Windows Server 2003 adds several command-line tools for managing local storage. These tools include the following:
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