Total read/write iops for 2 node RAC

Hi,

I have 2 AWR reports for the same time period each for a Node in a 2 node RAC Database.

The "physical read total IO requests" and "physical write total IO requests" in each of the AWR reports, is it per Node or total for the whole Database?

To get the total for the whole DB (for 2 nodes) should I add the 2 values from the 2 AWR reports to get the read or write total IO ?

Thanks

Alaa