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Creating Fault Tolerance for the System Volume
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Because RAID-5 is a native dynamic volume, it is not possible to install or start the Windows Server 2003 operating system on a RAID-5 volume created by the Windows Server 2003 fault-tolerant disk technologies.
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Hardware RAID, however, is invisible to Windows Server 2003, so the operating system can (and should, where available) be installed on hardware RAID arrays.
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The only option for creating fault tolerance for the system, without buying hardware RAID, is thus to mirror the system volume. You can mirror the system volume by following the procedures described for creating a mirrored volume: right-click the system volume and choose Add Mirror. Unlike Windows 2000, you do not need to restart, and
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Managing Microsoft Windows Server 2003 Disk Storage
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the BOOT.INI file is updated automatically so that you can start to the secondary drive if the primary drive fails. If the drives are attached to IDE controllers, and the primary drive fails, you might have to remove that drive, change the secondary drive to the primary controller, and set its jumpers or cable position so that it is the master. Otherwise, the system might not boot to the secondary drive.
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If you are going to mirror the system volume, do so on one or two SCSI controllers. If you use two controllers, make sure they are of the same type. This configuration will be the most easily supported and recovered.
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Upgrading Disks
There are two potential gotchas when you upgrade disks from previous versions of Windows, or attempt to move disks to a computer running Windows Server 2003 from a computer running a previous version of Windows. First, if a disk was configured in a computer running Windows 2000 as a basic disk, then was converted to dynamic, you cannot extend that disk s simple volumes onto other disks using Windows Server 2003. In other words, if you move that disk to a computer running Windows Server 2003, or upgrade the operating system to Windows Server 2003, you cannot create spanned volumes out of the disk s simple volumes. Second, Windows Server 2003 no longer supports multidisk arrays created in Windows NT 4. Windows NT 4 created mirrored, striped, and striped-with-parity (RAID-5) sets using basic disks. Windows 2000 permitted the use of those disk sets, although it was important to convert the sets to dynamic quickly to facilitate troubleshooting and recovery. Windows Server 2003 does not recognize the volumes. On the off chance that you upgrade a server from Windows NT 4 to Windows Server 2003, any RAID sets will no longer be visible. You must first back up all data prior to upgrading or moving those disks, and then, after recreating the fault-tolerant sets in Windows Server 2003, restore the data.
Practice: Planning RAID Configuration
In this practice, you will evaluate a server and its storage capacity against the requirements of contoso.com and determine an appropriate configuration. You administer a server for Contoso, Ltd. The server has four disks on a SCSI subsystem:
Disk 0: 80 GB
Lesson 4
Implementing RAID
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Disk 1: 80 GB Disk 2: 40 GB Disk 3: 40 GB
You recently performed a clean installation of Windows Server 2003 by backing up all data on the disks, removing all partitions from those disks, and installing the operating system on a 20-GB partition on Disk 0. You are now required to configure all the remaining drive space. User data will not be stored on the operating system volume. You want to maximize data storage and ensure uptime in the event of a single disk failure. What configuration do you implement, and what will the total storage capacity for user data be The answer is a combination of RAID-5 and mirrored volumes with a total capacity for user data of 140 GB. To ensure uptime in the event of a single disk failure, you must provide fault tolerance for the operating system itself. Only a mirrored volume is capable of doing that; you cannot install or host the operating system on a RAID-5 volume. A minimum disk space of 20 GB is therefore required to mirror the operating system. A RAID-5 configuration maximizes disk space without sacrificing single-disk failure fault tolerance. You can configure a RAID-5 volume with three or more disks. In this scenario, configuring a RAID-5 volume with all four disks would maximize data storage. A RAID-5 volume s stripe can be only as wide as the smallest amount of unallocated space, so although disk 0 and 1 have 60 and 80 GB free, respectively, the smaller (40 GB) drives will determine the capacity of the volume. With a 40 GB space on four drives, the volume has a potential capacity of 160 GB, but RAID-5 uses the space equivalent to one disk for parity, meaning that the resulting capacity for data storage in this volume will be 120 GB. That leaves disk 0 with 20 GB of unallocated space and disk 1 with 40 GB of unallocated space. You can configure the mirror of the operating system volume on disk 1, leaving 20 GB on that drive. The remaining space (20 GB per disk on disks 0 and 1) can be configured as a mirrored volume for user data with a storage capacity of 20 GB. A simple, spanned, or striped volume would not be fault tolerant, and a RAID-5 volume requires a minimum of three physical disks, so a mirror is the most effective way to use remaining space for fault-tolerant data storage.
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