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Managing Microsoft Windows Server 2003 Disk Storage
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Because as many as 32 disks can participate in a RAID-5 volume, you can theoretically configure a fault-tolerant volume that uses only 1/32 of its capacity to provide fault tolerance for the entire volume.
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Configure RAID-5 Volumes
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You need to have space on at least three dynamic disks to be able to create a RAID-5 volume. Right-click one disk s unallocated space and choose New Volume. The New Volume Wizard will step you through selecting a RAID-5 volume type and then selecting the disks that will participate in the volume. The capacity of the volume is limited to the smallest section of unallocated space on any one of the volume s disks. If Disk 2 has 50 GB of unallocated space, but Disks 3 and 4 have 100 GB of unallocated space, the stripe can use only 50 GB of space on Disks 3 and 4 the space used on each disk in the volume is identical. The capacity, or Volume Size reported by the New Volume Wizard, will represent the amount of space available for data after accounting for parity. To continue our example, the RAID-5 volume size would be 100 GB the total capacity minus the equivalent of one disk s space for parity. RAID-5 volumes can be assigned a drive letter or folder paths. They can be formatted only with NTFS. Because RAID-5 volumes are created as native dynamic volumes from unallocated space, you cannot turn any other type of volume into a RAID-5 volume without backing up that volume s data and restoring into the new RAID-5 volume.
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Recovering a Failed RAID-5 Volume
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If a single disk fails in a RAID-5 volume, data can continue to be accessed. During read operations, any missing data is regenerated on the fly through a calculation involving remaining data and parity information. Performance will be degraded and, of course, if a second drive fails, it s time to pull out the backup tapes. RAID-5 and mirrored volumes can sustain only a single drive failure. If the drive is returned to service, you might need to rescan, and then you will need to right-click the volume and choose Reactivate Volume. The system will then rebuild missing data, and the volume will be fully functional again.
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As with a mirrored volume, the first step in troubleshooting a failed RAID-5 volume should be to reactivate the volume. This operation is nondestructive and attempts to bring the failed volume online as Healthy.
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Implementing RAID
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If the drive does not offer a Reactivate option, or if you have had to replace the disk, you might need to rescan, initialize the disk, convert it to dynamic, and then right-click the volume and choose Repair Volume. You will be asked to select the disk where the missing volume member should be re-created. Select the new disk and the system will regenerate the missing data.
Mirrored Volumes versus RAID-5 Volumes
Mirrored volumes (RAID-1) and RAID-5 volumes provide different levels of fault tolerance. Deciding which option to implement depends on the level of protection you require and the cost of hardware. The major differences between mirrored volumes and RAID-5 volumes are performance and cost. Table 11-2 describes some differences between software-level RAID-1 and RAID-5.
Table 11-2
RAID Performance and Costs
Striped Volumes with Parity (RAID-5) Cannot protect system or boot partition Requires a minimum of three hard disks and allows a maximum of 32 hard disks Has a lower cost per MB 33 percent maximum redundancy* Has excellent read and moderate write performance Requires more system resources
Mirrored Volumes (RAID-1) Can protect system or boot partition Requires two hard disks Has a higher cost per MB 50 percent redundancy* Has good read and write performance Uses fewer system resources
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