Each RAID geometry requires a minimum number of available drives in order to configure an array using that geometry. For example, a RAID 6 geometry requires that you specify at least four available drives. The number of drives that you have specified is less than the minimum number of drives that are required for the RAID geometry that you have specified.
Ensure that you specify a sufficient number of drives to accommodate the RAID geometry that you specify, and resubmit the command. You might want to specify a different number of drives or a different RAID geometry.