Hello Shreya,
Well first of all shreya u need to check out whether u
want to have inbuilt or module support for LVM and Raid in kernel and
raid support is only required when u are having Raid partition for Linux.
Which kernel version 2.6 latest series & for which flavor u want to
add support for RAID in Red Hat,Ubuntu or Debian/Mandriva etc.If you
know how to recompile the kernel you can easily do that.
Linux Rocks!
Alok