How do I enable multipathing from multiple I/O controllers back to the same storage in Red Hat Enterprise Linux 3?

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First you must confirm that your storage device is capable of such functionality. Next, you will need to configure your storage to enable multiple controllers to access the same partition at the same time. This will vary from device to device and instructions are available from the hardware manufacturer. Many storage devices prevent this sort of utility by default.

Using mdadm

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