Just wanted to add to what was already mentioned.  As already stated, in the GUI you would add the drives one at a time when creating the raid group.  However, just wanted to point out that when viewing the RAID Group properties, you want to read it from the bottom up.  For example, to accomplish the following (first pair color-coded to emphasize sort order in GUI when viewing Raid Group Properties):  =========== Bus 2 enclosure 4 Disk 6  <= PrimaryBus 3 enclosure 4 Disk 6  <= Secondary  =========== Bus 3 enclosure 4 Disk 7  <= Secondary  You would add in the GUI, one-at-a-time in the following order: 2_4_6, 3_4_6, 2_4_7, and 3_4_7.  To verify this, view the "Disk" tab under the Raid Group Properties; again, you want to read it from the bottom up which will correspond to the order as they were added originally.  For the example above, it would display as follows:  Bus 3 enclosure 4 Disk 7  <= Secondary Bus 2 enclosure 4 Disk 7  <= Primary Bus 3 enclosure 4 Disk 6  <= Secondary Bus 2 enclosure 4 Disk 6  <= Primary   As for performing the raid group creation and verification via CLI, please refer to the following knowledgebase article:  emc59462: "Determining order in which disks are bound in RAID 1/0 group"  The creation ("createrg") is straight-forward; however, please note when verifying ("getrg"), the displayed order is different depending on whether or not at least one LUN is bound on the raid group!
Is there a way in the GUI to find out the primary disk and its mirrored partner - is it just a case of of viewing the disk order in the Raid group   Bus 2 enclosure 4 Disk 6  Bus 2 enclosure 4 Disk 7  Bus 3 enclosure 4 Disk 6  Bus 3 enclosure 4 Disk 7  if that is the case would 2_4_6 and 2_4_7 would be the primary and mirrored pair?  Leading on from that is naviseccli the only way to do horizontal raid groups as I can see all disk when I go to create Raid group on flare 29.  Thanks 
Raid 1/0