This is something that should really be discussed with your SE or sales team. The PVR should specify what type of checksum you are intending to use, and the checksum type is going to be dependent on the array type and workload the storage is going to be performing. I'm not familiar with STK arrays so there may be limitations that would prevent you from using ZCS with STK. ZCS is not supported for use with deduplication so this is something to consider as well. BCS can provide better performance for random I/O workloads, and ZCS for sequential I/O, however that discussion should be had with the sales team which has a more intimate knowledge of your environment.