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Chapter 2 Configuring the Xserve G5 PCI Hardware RAID Card 19

Using Megaraid to Create a RAID Volume

Creating a Single RAID Volume

Depending on the number of drives in your Xserve G5, you can create the following

volume configurations:

JBOD mode, the default configuration of the RAID card, presents each hard drive

connected to the card as a standalone volume. JBOD mode is only available if you do

not create a RAID volume. Once you create a RAID volume, JBOD mode is no longer

available. To return the RAID card to its default configuration in JBOD mode, use the

command megaraid -destroyconfig.

To automatically configure a single RAID volume with the optimum configuration and

RAID level for the number of drive modules installed in your Xserve, type:

megaraid -create auto

When issued on a two-drive configuration, the command builds a RAID 1 (mirrored)

volume. For a three-drive configuration, the command builds a RAID 5 volume.

Creating Two RAID Volumes

To create two RAID volumes of equal size using the same automatic configuration rules

mentioned above, type:

megaraid -auto -numld 2

Creating Multiple RAID Volumes

You can also create more advanced RAID configurations, including creating multiple

logical drives, using the megaraid -create command with specific parameters.

To create a RAID 5 volume 100 MB in size using all three drives, type:

megaraid -create R5 -drive 0 1 2 -size 100

If “-size” is omitted, the volume will be created using all available remaining capacity.

To create a RAID 1 volume 50 MB in size using the first two drives, type:

megaraid -create r1 -drive 0 1 -size 50

Drives Possible configurations

1 drive JBOD, RAID 0

2 drives JBOD, RAID 0, RAID 1

3 drives JBOD, RAID 0, RAID 1 with hot spare, RAID 5

Warning: The megaraid -destroyconfig command destroys any existing RAID

configuration and all data on the volume is lost.

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Apple Xserve G5 Betriebsanweisung Seite 19