RAID5 Default strip element

I think you may be confusing Stripe Size and Stripe Element.

The stripe element is the amount of contiguous data stored on a single disk of the stripe. Stripe elements are measured in 512 byte blocks or in kilobytes (KB). The default CLARiiON stripe element size is 128 blocks, which is 64 KB. The stripe element size is not configurable through Navisphere. The default element size has been highly optimized for FLARE. Attempts to ¿tune¿ it are likely to reduce performance.

The stripe size is the amount of user data in a RAID group stripe. This does not include drives used for parity or mirroring. The stripe is measured in KB. It is calculated by multiplying the number of stripe disks by the stripe element size.

For example, an eight-disk RAID 1/0 has a stripe width of four and a stripe element size of 64 KB has a stripe size of 256 KB (4 * 64 KB). A five-disk RAID 5 with a 64 KB stripe element size also has a stripe width of 256 KB drive.

This information and more on CLARiiON terminology can be found in the "EMC CLARiiON Storage System Fundamentals for Performance and Availability" document available on PowerLink.