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Managing Microsoft Windows Server 2003 Disk Storage
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RAID-5 volume A RAID-5 volume is a fault-tolerant striped volume. Space on three or more physical disks is unified as a single volume. Data is written to all physical disks at the same rate, but unlike a striped volume, the data is interlaced with checksum information, called parity. Should a single disk in the volume fail, the data on that disk can be regenerated through calculations involving the remaining data and the checksum information. It is an interesting technical note that parity is distributed among all volumes in the RAID-5 set.
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Basic vs. Dynamic Disks
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So now that you know about basic and dynamic storage and the types of partitions, logical drives, and volumes they support, which is better The answer, as is frequently the case, is: It depends. Dynamic disks that store data are easily transferred between servers, allowing you to move a disk from a failed server to a functioning server with little downtime. Dynamic disks flex their muscle when there is more than one dynamic disk in a computer. Each computer running Windows 2000, Windows XP, and Windows Server 2003 can support one disk group, which itself can contain multiple dynamic disks. The LDM database is replicated among all disks in the disk group, which increases the resiliency of disk configuration information for all the group s disks. In addition, disks can be configured to work together to create a variety of flexible and powerful volume types including spanned volumes, striped volumes (RAID-0), mirrored volumes (RAID-1), and stripedwith-parity volumes (RAID-5). Basic disks will continue to be used, however, for several reasons:
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Basic storage is the default in Windows Server 2003, so all new disks are basic disks until you convert them to dynamic a simple process you will learn in Lesson 2. Dynamic disks do not offer advantages over basic disks in a computer that will have only one physical disk. The behavior of the LDM database also makes it difficult to transfer a dynamic disk used for starting the operating system to another computer when the original computer fails. Dynamic disks are not supported for removable media and are not supported on laptops. Basic storage is the industry standard, so basic drives are accessible from many operating systems, including MS-DOS, all versions of Microsoft Windows, and most non-Microsoft operating systems (there are a few). Therefore, dynamic disks cannot be used if you need to dual-boot an earlier operating system that requires access to the disks. Keep in mind that we are talking about local access only. When a client of any platform accesses files over the network, the underlying storage and volume type are transparent to the client.
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Lesson 1
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Understanding Disk Storage Options
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Multiboot scenarios are less common these days with the advent of virtual machine technology (see http://www.microsoft.com/windowsserver2003/techinfo/overview /virtualization.mspx). However, if you implement a multibooted system with Windows Server 2003 as one of the operating systems, you should install each operating system on a separate, primary partition. Other configurations are risky at best. For more information on multibooting, open the Help and Support Center and search using the keyword multiboot.
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Exam Tip
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. You are installing a new 200-GB disk drive. You want to divide the disk into five logical volumes for the operating system, applications, user home directories, shared data, and a software distribution point. The drive space should be distributed equally among the five logical volumes. You also want to leave 50 GB as unallocated space for future extension of a logical volume. Considering basic and dynamic disks and the types of logical volumes they support, what are your configuration options
2. Which of the following provides the ability to recover from the failure of a single hard drive a. Primary partition b. Extended partition c. Logical drive d. Simple volume e. Spanned volume f. Mirrored volume g. Striped volume h. RAID-5 volume 3. You are dual-booting a system in your test lab. The computer has Windows NT 4 installed on the first primary partition and Windows Server 2003 installed on the second primary partition. The computer is running low on disk space, so you add a new disk drive. You boot to Windows Server 2003 and configure the drive as a
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