Symmir - VMAX

Hi all,

I have to create few BCV devices for symmir operation, they are going to be virtual volumes which will be bound to a thin pool, what will be the device configuration? (BCV+TDEV) is it correct;

After reading some forums I understood with latest enginuity code or with VMAX, symmir at the backend behaves the same way as Timefinder clone, so obviously the device need not require to be 100% pre-allocated, but what will be the best practice for BCV device for symmir operation?