The MS SQL Tips article below talks about "I/O Stalls" in investigating I/O bottlenecks. In DPA Write performance by file there
is also a bar graph Total Wait and I/O Wait By File. Are I/O Wait Stalls the same as the I/O Wait represented in that graph?
https://www.mssqltips.com/sqlservertutorial/254/investigating-io-bottlenecks/