ASM high redundancy on the quarter grid should be possible

I was reading the white paper "Best practices for Database Consolidation on Exadata Database Machine" http://www.oracle.com/technetwork/database/features/availability/exadata-consolidation-522500.pdf and came across this statement

On page 5

«There is also the possibility of deploying a smaller pool consisting of a support in 2-2 quarter Exadata X for entry level of vital systems consolidation No.» This option is not recommended for the basic needs of the company because it does not fully support ASM disk groups high redundancy (full support for high redundancy ASM disk groups requires a minimum of Exadata X 2 - 2 half rack). »

A quarter rack has 3 storage cells seems to me that a high redundancy should be possible. can someone shed some light on the origin and significance of this statement?
Thank you
Robin

The reason that you can't high redundancy on all starts in a quarter of a rack is due to requirements for OCR/voting records when they reside within the ASM. For OCR and voting records be placed in high ASM diskgroup redundancy, it takes 5 failgroups. Because a quarter rack has only 3 cells, one of your start (probably DBFS_DG) must be normal redundancy to meet the OCR and voting disk conditions.

It is possible to have DATA and RECO be high redundancy on the grid of a quarter, but they cannot hold OCR and voting disks.

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