Where does the heavy I/O take place?

I’ve set up my node with 2 SSD disks. A smaller and slower one where the OS is installed and a larger and faster one for the node related I/O.
Now I’m wondering where that I/O will occur, in order to make sure it’s mapped to the fast device.
In the base directory of the node only log files seem to be written. Is the I/O all happening in the attached Postgres DB?

Currently the only I/O you will see are the log files.

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