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Managing Microsoft Windows Server 2003 Disk Storage
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partition table of the Master Boot Record (MBR) on the physical disk. A basic disk can contain as many as four partitions, consisting of either four primary partitions or three primary partitions and one extended partition. The logical volumes on a basic disk are primary partitions and logical drives. The logical volume, as mentioned, can be represented by zero or more drive letters and can be mounted to folders on an existing NTFS volume.
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Primary partition Each primary partition maintains one logical volume on a basic disk. If a basic disk is used to start the operating system, one and only one primary partition on the disk must also be marked as active.
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The computer s basic input/output system (BIOS) looks to the active partition to locate the hardware-specific files required to load the operating system. That partition is technically referred to as the system partition and is usually assigned drive letter C. Once the boot process has begun, the operating system is loaded. Most servers are configured with the operating system on the C drive as well. The partition on which the operating system is stored is called the boot partition. Yes, it can get confusing, particularly because the same volume is referred to by the variable %Sysvol%. Fortunately, it s not a distinction you re likely to need to know, since most installations are completely on drive C, making the C drive the system partition, the boot partition, and %Sysvol%.
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Extended partition A basic disk may also contain an extended partition. Unlike primary partitions, extended partitions are not formatted or assigned drive letters. Instead, extended partitions are further divided into logical drives. Logical drives are logical volumes on a basic disk.
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In earlier versions of Microsoft operating systems, including Microsoft Windows 95, Windows 98, and MS-DOS, the operating system could only see the primary partition on which it was installed, plus the extended partition on the drive, if one existed. If you wanted additional storage segments on the drive, you had to configure an extended partition and apportion it into one or more logical drives. Because Microsoft Windows NT, Windows 2000, Windows XP, and Windows Server 2003 can access all partitions on a disk, you need only an extended partition if you want more than four logical drives on a single disk.
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Dynamic Disks and Volumes
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Microsoft Windows 2000, Windows XP, and the Windows Server 2003 family also support dynamic storage. The storage units on dynamic disks are called volumes. You can create up to 2,000 dynamic volumes, although the recommended number of dynamic volumes is 32 or less. The identifier of a physical disk, and the configuration information about its volumes, are stored on the disk in a database controlled by the Logical Disk Manager (LDM) service.
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Lesson 1
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Understanding Disk Storage Options
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The logical volume of dynamic disks is the volume. Dynamic disks support simple volumes on a single disk. When a computer has more than one dynamic disk, you are provided more storage options from which to choose. Spanned, mirrored (RAID-1), striped (RAID-0), and striped with parity (RAID-5) volumes are logical volumes that utilize space on more than one physical disk. Each volume type uses disk space differently, and is characterized by a different level of fault tolerance. The list below summarizes the volume types, though each has nuances you will learn about as the chapter progresses.
Simple volume The equivalent to a basic disk partition is a dynamic disk simple volume. Simple volumes use space on a single physical disk and correspond to a single logical volume. Simple volumes can be extended by appending unallocated space on other regions of the same disk, allowing you to adjust a volume s capacity with the growth of data stored in that volume. Because simple volumes exist on only one physical disk, they are not fault-tolerant. Spanned volume A spanned volume includes space on more than one physical disk. Up to 32 physical disks can participate in a spanned volume, and the amount of space used on each disk can be different. Data is written to the volume beginning with the space on the first disk in the volume. When the space on the first disk fills, the second disk is written to, and so on. Spanned volumes provide an option for increasing drive capacity. If a simple or spanned volume is filling up, you can extend the volume onto additional new storage capacity. But spanned volumes are not fault-tolerant and cannot participate in any faulttolerant configurations. Because their size tends to be greater, and because multiple physical disks are involved, the risk for failure increases. If any one disk in a spanned volume is corrupted or lost, data on the entire volume is lost as well. For these reasons, Windows Server 2003 will not allow the installation of the operating system on a spanned volume, nor can you extend or span the system volume. Spanned volumes are recommended only as a stop-gap measure when an existing volume fills to capacity or in situations where tolerance for failure is high for example, a large library of read-only data that can easily be restored from tape backup in the event of failure.
Striped volume A striped volume (RAID-0) combines areas of free space from multiple hard disks into one logical volume. Unlike a spanned volume, however, data is written to all physical disks in the volume at the same rate. Because multiple spindles are in use, read and write performance is increased significantly as additional physical disks are added to the stripe. But like extended simple volumes and spanned volumes, if a disk in a striped volume fails, the data in the entire volume is lost. Mirrored volume A mirrored volume (also known as RAID Level 1, or RAID-1) consists of two identical copies of a simple volume, each on a separate hard disk. Mirrored volumes provide fault tolerance in the event that one physical disk fails.
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