No silver bullet, this is too broad of a question and the right answer depends on you specific environment.

Start here go get the basic storage attributes concepts... http://youngcow.net/doc/oracle10g/se...clauses007.htm
... then research ASSM and MSMM, finally research physical implementation.

Are you going to know how to do it right after reading all the above mentioned material? unfortunatelly the anser is NO but, you are going to get a feeling about what are you dealing with.