/dev/cciss are not there any more in RHEL6

Surprise! Another change from RHEL5 to RHEL6. the local HD is not /dev/cciss/c0d0 any more! it is /dev/sda

why?
check out https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Technical_Notes/ar01s09s02.html?