i think you need to revisit some fundamentals  White Paper: EMC Unified Storage System Fundamentals for Performance and Availability   White Paper: EMC Unified Storage Best Practices for Performance and Availability: Common Platform and Block Storage 31.5 — Applied Best Practices
Hi everyone!  Imagine that I have 6 disks and I want to use RAID 5. A RAID 5 pool needs at least 3 disks so I have two options:   EMC technician suggested me to use the first option but now I am wondering why should I don't use the second. In case of a disk failure, with the first option I would lose the whole storage whereas with the second option I would just lose half of the storage. Probably I am missing something, so could anyone explain me what would be the advantages of the first approach?  Thank you
RAID 5 options