Are these 24 disks the only disks from particular speed/size ? If you have other disk groups with the same type of disks, you can ask EMC to join these disks groups and you will end up with much better configuration.
I would like to know the feasability of creating tdats on specific disks of a diskgroup.  The diskgroup has 24 disks and in a couple of weeks time 8 disks will be moved to a different disk group, so is it feasible to create TDATS on specific 16 disks only without spreading hypers on remaining 8 disks?  Thanks
Creating TDATs on specific disks of a diskgroup