Apple 10.6 manual So the command is, About Creating a RAID Set

Additional information about diskutil and other uses can be found in Introduction to Command-Line Administration. For complete command syntax for diskutil, consult the tool’s man page.

The specific command issued depends on your disk format needs and the hardware in use. Take care to use command-line arguments that apply to your specific needs.

The following command is a sample, which partitions a computer’s only 120 GB hard disk into two equal 60 GB journaled HFS+ volumes (“BootDisk” and “DataStore”), which can start up an Intel-based Mac computer.

The basic syntax is:

diskutil partitionDisk device numberOfPartitions GPTFormat <part1Format part1Name part1Size> <part2Format part2Name part2Size>

So the command is:

diskutil partitionDisk disk0 2 GPTFormat JournaledHFS+ BootDisk 50% JournaledHFS+ DataStore 50%

About Creating a RAID Set

If you’re installing Mac OS X Server on a computer with multiple internal hard disks, you can create a RAID set to optimize storage capacity, improve performance, and increase reliability in case of a disk failure.

For example, a mirrored RAID set increases reliability by writing your data to two or more disks at once. If one disk fails, your server uses another disk in the RAID set.

You can use Disk Utility to set up a RAID set. There are two types of RAID sets and one additional disk option available in Disk Utility:

ÂÂ A striped RAID set (RAID 0) splits files across the disks in the set. A striped RAID set improves the performance of your software because it can read and write on all disks in the set at the same time. You might use a striped RAID set if you are working with large files, such as digital video.

ÂÂ A mirrored RAID set (RAID 1) duplicates files across the disks in the set. Because this scheme maintains copies of the files, it provides a continuous backup of them. In addition, it can help keep data available if a disk in the set fails. Mirroring is recommended if shared files or applications must be accessed frequently.

You can set up RAID mirroring after installing Mac OS X Server if you install on a disk that isn’t partitioned. To prevent data loss, set up RAID mirroring as soon as possible.

ÂÂ A concatenated disk set lets you use several disks as a single volume. This is not a true RAID set and offers no redundancy or performance increase.

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Chapter 5    Installation and Deployment