In SAN Storage environment, storage administrator allocates storage to different Operating System (OS). There are many things that need to consider by the storage administrator before present any SAN Storage to any host. Hence, the best practice is very important, else the client / HOST will encounter performance issues in the future. 

Many people asking, what is the best practice and design for EMC Symmetrix DMX? Always, the Storage administrator has to gather and understand the customer requirement, for example, what type of Database they are running? What application they are using?  What protection disk level should we use? There are various disk types, such as Fibre Channel and lower performance, higher capacity (LPHC) disk.  Different RAID configurations such as RAID 5 (3+1, 7+1), RAID 1, and the newly released RAID 6 (6+2, 14+2) may be deployed in order to optimize storage requirements and meet cost needs. For the purposes of this project, LPHC disk was used. Are they using different disk alignment? Once the storage administrator understands the entire customer requirement, then the next step is to plan about the back-end disk configuration on Symmetrix DMX.  

In Summary decision need to be taken balance off all:
1) Quantity of meta volume members
2) The number of physical disk slices
3) Performance required
4) Future capacity expansion
5) Channel capacity
6) Host administration required

A simple general guide use the following:
(Ideal) Create 18570 volumes, all volumes striped @1MB in host stripe set
(Good) Create 18570 volumes, create Meta with 4-8 members
(OK) Create 18570 volumes, create Meta with 16 members
(Warn) Create 18570 volumes, create Meta with 17+ members

For the smaller Datasets system, it is best to use the smaller split sizes and combined into meta volumes for extra-performance with high-load but small-capacity applications.
For the huge or bigger dataset, it is best to use the bigger split sizes. Let say the volumes for an application spread over a minimum 8 physical disks where possible, it require a volume per physical. By standard, most of the host can only see the maximum 512 host volumes (1 Metavolume = 1 host volume, 1 non-meta volume = 1 host volume) per channel.