What is the command to see if a directory belongs to a specific disk?

Question

linux

I have a ready server prepared by other people. 2 disks in RAID1 and 2 more disks in RAID1.
How can I see what drive a directory is on? For example / var / lib / pgsql I will need to put it on another disk if it is on the same where the OS is, otherwise there will be a heavy load. How can I see which drive this directory is located on?

Answer 1

df -h directory path