HA comparison EMC products versus Oracle exadata

Recently i got a chance to do the high availability test on an exadata equipment and i was surprised to note that the data was intact even after pulling 7 disks out of the total 84 disks. I started thinking is Exadata outperforming in terms on HA compared to EMC?? i dont know the how Oracle get this done, but one thing i  know is the disk group is cofigured with three way  mirroring.

what is so extra special here which i  dont know yet? what you guys think?