What the general trend in administering Exadata DB Machine – entirely DBA, or same old traditional

Hi Guys,

We are trying to define the responsibilities for managing the Exadata DB machine. So looking some guidelines who should be responsible.

Like entirely DBA team should be managing all the components or we should go the traditional way of managing OS by SA and storage by storage team.

Obviously Grid Disks and ASM will be managed by DBA team.

Also I need the %age of work to be performed on Exadata  machine by each team like -
DBA
SA
Network Admins
Storage Admins

Regards,

-ss