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Using Windows NT Disk Administrator
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The key to managing your hardware storage devices is understanding the Disk Administrator program. To run this application, click the Disk Administrator icon in the Administrative Tools program group. The default screen looks like the one shown in Figure 3-10.
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NOTE: The first time you use Disk Administrator, you will be told that the program needs to add information to the drive. This is a safe process and is used by Windows NT to uniquely identify each disk in your system (since drive labels, locations, and boot status can all be changed).
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The graphical display of Disk Administrator shows you the relationship between the physical drives and logical partitions on your system. Figure 3-10 shows a configuration
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Figure 3-10.
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of three logical disk partitions located on two physical drives and one CD-ROM drive. A many-to-many correspondence exists between disks and partitions in NT. For example, you could have several disks make up a single partition (as is the case with disk striping, described later), or you may have one physical disk with multiple partitions. Additionally, in Windows NT, you can assign specific drive letters to each partition: simply right-click the desired partition and choose Change Drive Letter.
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CAUTION: Changing drive letters may have effects outside of Windows NT. If you are running other OSs on the machine, you should not change the drive letters from their defaults; otherwise some of your programs may fail to run. Also, certain applications will use specific drive letters to look for needed media. For example, if you change the letter of your CD-ROM drive, your favorite game may not be able to access required data from the CD.
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RAID Levels
RAID specifies different arrangements of physical and logical hard disks. Levels of RAID can provide fault tolerance, improve performance, or do both. Windows NT supports the following levels of RAID: w RAID 0: Disk Striping Optimizes performance by spreading data across several physical drives:
Disk Striping offers no fault tolerance, but it enhances manageability by creating one large volume from at least two smaller disks. s RAID 1: Disk Mirroring Stores all data on two physical drives, which are always kept synchronized:
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Disk Mirroring provides fault tolerance and a slight performance increase, but reduces usable storage space by 50 percent. s RAID 5: Disk Striping with Parity drive: Uses one disk in an array as a parity
Disk Striping with Parity can survive a failure in any disk without data loss or interruption of service (although performance will decrease). Table 3-3 compares the general effects on performance and disk space when these RAID levels are implemented. One limitation is that Windows NT Boot and System Partitions can only use RAID Level 1 (Disk Mirroring) for protection. Implementing RAID Level 5 (Disk Striping with Parity) does come at a price: Server processing and memory will be used for calculating, reading, and writing the additional information required. However, having multiple physical disks working at the same time will decrease data access times, and performance degradation with modern processors will be negligible. In 5, we ll examine the benefits of choosing a hardware-based RAID solution. It is important to note that implementing RAID is not a substitute for maintaining regular backups. Although RAID-based fault tolerance will protect against physical disk failures, it will not protect against the accidental deletion of files or a natural disaster. As we saw in previous chapters, loss of data due to user error and other unwanted changes are often more likely than hardware failures. Nevertheless, on the server side, systems administrators find investing in RAID solutions to be an excellent data protection solution.
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