To RAID or not to RAID...

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Greetings again!

After reading RedHat documentation regarding optimizing Gluster storage another question comes to my mind:

Let's presume that I want to go the distributed dispersed volume way. Three nodes which two bricks each. According to RedHat's recommendation, I should use RAID6 as underlying RAID for my planned workload.
I am frightened by that "waste" of disks in such a case:
When each brick is a RAID6, I would "loose" two disks per brick - 12 lossed disks in total. In addition to this, distributed dispersed volume adds another layer of lossed disk space.

Am I wrong here? Maybe I didn't understand the recommendations wrong?

Markus
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