For me the manual is wrong because the SC sizer shoes clearly 6 disk as minimum when selecting single redundancy and 7 disks with dual redundancy. Regards,Joerg
I have a SCv3020 with six 450GB SSD and sixteen 1TB 10k drives. When I create a Storage Type, I set the Tier 1 SSD's and Tier 3 10k drives both to Dual Redundancy. After doing so, I receive an alert: Storage type Assigned - Redundant - 2 MB tier High has insufficient disks to support parity raid. The related help Article Number: 000121334 says: This is an informational alert that there are not enough drives in a specific tier to support parity RAID which require a minimum of 5 managed disks for RAID 5-5 and 6 managed disks for RAID 6-6.  A system which is unable to use parity RAID will result in inefficient use of space as it is forced into using exclusively RAID 10 (100% overhead) or RAID 10-Dual Mirror (200% overhead). As mentioned above, I have six drives in Tier 1, so why am I getting the alert? What am I missing?  
2 MB tier High has insufficient disks to support parity raid?