Striped Volumes in VS .NET

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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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Note You might not experience a performance improvement on IDE unless you use sepa rate 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 Wiz ard 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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Lesson 4
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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 as 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.
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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 vol ume 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 recreate the volume. Then you must restore data from the backup.
Striped volumes provide maximum storage and performance but support no fault tolerance. The only recovery potion is that of your regular backup routine.
Exam Tip
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 cre ate a configuration called duplexing ) for maximum performance. 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 choos ing Add Mirror and selecting a drive with sufficient unallocated space. Once you have established the mirror, the system begins copying data, sector by sec tor. During that time, the volume status is reported as Resynching.
Recovering from Mirrored Disk Failures
The recovery process for a failed disk within a mirrored volume depends on the type of failure that occurs. If a disk has experienced transient I/O errors, both portions of
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11
Managing Microsoft Windows Server 2003 Disk Storage
the mirror will show a status of Failed Redundancy. The disk with the errors will report a status of Offline or Missing, as seen in Figure 11-8.
Figure 11-8
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