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One feature that this article overlooks is Oracle's Automatic Storage Management feature (ASM) which is very commonly used with RAC. This feature is basically a software level RAID alternative in which you can define striping and mirroring independent of what the hardware reflects.

This article also does not really reflect what is commonly done with SAN implementations.

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Actually most production databases tend not to use ASM's High or Normal redundancy because the software level redundancy provided by ASM tends to perform very badly when compared to a storage controller driven RAID. External redundancy is usually chosen. ASM is primarily used to easily manage the disk groups when the volumes in the disk group tend to run out of space.

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