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Questions about RAID on the Windows Server 2003 certification exams always refer to the software-based RAID supported by the operating system. If you are accustomed to working with hardware RAID, forget everything you know about it when you are presented with RAID questions: Focus on the implementation of RAID on Windows Server 2003.
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Striped Volumes
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A striped volume, which implements RAID Level 0, uses two or more disks and writes data to all disks at the same rate. By doing so, I/O requests are handled by multiple spindles, and read/write performance is the beneficiary. Striped volumes are popular for configurations in which performance and large storage area are critical, such as computer-aided design (CAD) and digital media applications.
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You might not experience a performance improvement on IDE unless you use separate controllers. Separate controllers ideally, one for each drive will improve performance by distributing I/O requests among controllers as well as among drives.
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Creating a Striped Volume
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To create a striped volume, you must have unallocated space on at least two dynamic disks. Right-click one of the spaces and choose Create Volume. The New Volume Wizard will step you through the process of selecting a striped volume and choosing other disk space to include in the volume. Striped volumes can be assigned a drive letter and folder paths. They can be formatted only with NTFS.
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Implementing RAID
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Up to 32 disks can participate in a striped volume. The amount of space used on each disk in the volume will be equal to the smallest amount of space on any one disk. For example, if Disk 1 has 200 GB of unallocated space, and Disk 2 has 120 GB of space, the striped volume can contain, at most, 240 GB because the size of the stripe on Disk 1 can be no greater than the size of the stripe on Disk 2. All disk space in the volume is used for data; there is no space used for fault tolerance.
Recovering a Striped Volume
Because data is striped over more than one physical disk, performance is enhanced, but fault tolerance is decreased there is more risk because if any one drive in the volume fails, all data on the volume is lost. It is important to have a backup of striped data. If one or more disks in a striped volume fails, you must delete the volume, replace the failed disk(s), and re-create the volume. Then you must restore data from the backup.
Exam Tip
Striped volumes provide maximum storage and performance but support no fault tolerance. The only recovery potion is that of your regular backup routine.
Mirrored Volumes
A mirrored volume provides good performance along with excellent fault tolerance. Two disks participate in a mirrored volume, and all data is written to both volumes. As with all RAID configurations, use separate controllers (by adding a controller, you create a configuration called duplexing ) for maximum performance and for fault tolerance at the controller level. Mirrored volumes relate to RAID-1 hardware configurations.
Create Mirrored Volumes
To create a mirrored volume, you must have unallocated space on two dynamic disks. Right-click one of the spaces and choose Create Volume. The New Volume Wizard will step you through the process of selecting a mirrored volume and choosing space on another disk to include in the volume. Mirrored volumes can be assigned a drive letter and folder paths. Both copies of the mirror share the same assignment. You can also mirror an existing simple volume by right-clicking the volume and choosing Add Mirror and selecting a drive with sufficient unallocated space. Once you have established the mirror, the system begins copying data sector by sector. During that time, the volume status is reported as Resynching.
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