Exactly for the response from Spril1967.  To resume (if i remember) :  Raid (3,5,6) Horizontal RG is simple for administration and better in case of DAE, LCC goes down Vertical RG : a too little additionnaly performance and not good in case of hardware (LCC, DAE) problem So Horizontal RG is better for Parity Raid.  Raid (1, 1/0) Horizontal RG is simple for administration Vertical RG : is very good to minimize rebuild time and little additionnaly performance, even if DAE gos down, you have access to your data So Vertical RG (create in CLi Mirror on a buses and original on other buses) is better for mirror raid.  Don't forget to balance between performance, redundancy and time to administrate.... There are no only ONE solution but many solution with advantages and disadvantages...  Why lost time to adminsitrate to win a little % of performance for example ?  Regards
create a RG in one DAE or a RG across many DAE, for performance, which is better?
vertical or horizontal RAID group