How indexes and tables are stored

Hi:

I want to now what the indexes and tables are stored in sapdb devspaces ?

If i have 3 disks, /hda, /hdb, /hdc.

I want :

/hda ---> sapdb programs.
/hdb ---> table data.
/hdc ---> index data

To make posible paralel access to de indexes and tables.

Is this posible ?
And is this necessary  for the optimization  ?

Thanks in advance.

Alejandro Michelin Salomon

PROBrax e-Tech, Brasil