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Windows Small Business Server 2003 supports a software implementation of RAID-5 that allows you to have a redundant file system without the 50 percent capacity overhead of using mirrored volumes. The overhead on a RAID-5 volume decreases for each additional disk you add to the volume, making this the most space efficient method of providing redundancy in Windows Small Business Server. Unfortunately, this efficiency doesn t come without some costs. RAID-5 arrays are inherently slower at write operations than even a plain old stand-alone drive. You also don t have the flexibility that you have with mirrored volumes in Windows Small Business Server. You can t simply remove a drive from a RAID-5 volume, nor can you break a failed drive out of the volume, allowing the remaining drives to regenerate. Further, when a disk fails on a RAID-5 volume, not only is the volume no longer redundant, but it also gets a lot slower because both read and write operations must calculate the correct value for every byte read or written. Some of the tasks you do with a mirror also apply to a RAID-5 volume. You can:

Create the RAID-5 volume. Assign a mount point or drive letter to the RAID-5 volume. Format the RAID-5 volume. Continue to use the RAID-5 volume after the failure of one of the

disks in the volume. What you can t do is add or remove disks from the RAID-5 volume once you have created it, except for replacing a failed disk. To be able to dynamically add and remove disks from a RAID-5 array, the array needs to be a hardware RAID array that supports dynamic reconfiguration. Real World Assigning Volume Names The name you assign to a volume, partition, or drive should tell you something about it rather than simply mimicking the drive letter. A volume name like Big70GBSCSI tells you pretty conclusively that it s that big new SCSI drive you just bought, unless, of course, you already have a half dozen of them on your server, in which case you re going to need to come up with a more effective name. On the other hand, a volume name of C_DRIVE is just about useless, because the drive letter is available from anywhere that the volume name is. A common scheme is to assign volume names based on the primary use of the volume, so UserHome or DB_STORE make it pretty clear which volume it is from a logical (but not necessarily physical) view.

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Windows Small Business Server allows you to mount a dynamic volume or any partition or logical drive in an extended partition on an empty directory of a non-removable NTFS drive. The volume being mounted appears to users as a simple directory. This feature makes it possible to create larger file systems that use multiple hard disks without the inherent risks of using spanned volumes, because the failure of any one of the mounted volumes affects only the directories that were part of that volume. You can also easily support multiple formats from a single drive letter. To mount a volume, complete the following steps: 1. From the Disk Management console, right-click a volume or partition. Choose Change Drive Letter And Paths from the shortcut menu. The Change Drive Letter And Paths dialog box opens. 2. Click Add. The Add Drive Letter Or Path dialog box (Figure 7-28) opens.

19. Right-click the Appearance and Themes button on the taskbar, and then click Close on the shortcut menu to close the window.

3. You can type the mount point or click Browse to select or create a mount point. Any empty directory that resides on a non-removable NTFS volume or drive can be the mount point. 4. After you select or type the mount point, click OK, and the volume or partition is mounted. Caution

It s actually easy to get yourself into trouble with this new feature. Disk Management lets you make multiple levels of mounted volumes, including ones that are recursive. You re well advised to mount volumes only at the root level of a drive. Trying to mount below that point can lead to confusion and make management and documentation difficult.

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Summary