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Issue description

Internal User Feedback

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Description:  ch02s05 -> Block Storage Scenarios

RAID is a common tech. on hardware based storage solutions, but it makes no sense in ODF (Ceph)

My comment on the RAID ref:
That's common, using some technologies, but it makes absolutely NO sense to provision multiple RBD devices and put them in a RAID configuration on the client side.

If a client require a different resiliancy level than what's configured on the particular SC backed ceph pool, then we create a new SC that makes use of an appropiately configured ceph pool. (Requires SE for external mode) 

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