Don't get all upset. You said stripe disks in your first comment, not mirror volumes. In a big system I am usually more concerned with avoiding any SPOF (that

Don't get all upset. You said stripe disks in your first comment, not mirror volumes. In a big system I am usually more concerned with avoiding any SPOF (that will cause downtime), then adding redundancy for the most likely failures. Individual mirrored pairs on split chassis will mitigate against long rebuild times for a single disk failure but it requires an all software architecture as the individual HBA can't do hot spare rebuild. It also reduces the benefit of the HBA cache. So intra chassis, striped mirrors; inter chassis, mirrored stripes. Of course, mirroring across striped mirrors would be better, but the cost to peak write and capacity might rule that out. Also, yes I believe you, EMC sucks. But they do have some good engineers.