What is waking my HDD up in Linux

When my disks wake up during the day, I am angry. I want silence, so I started investigating which process makes them to do that. I suspect that something is browsing Samba share, but to confirm I created this simple SystemTap script:

# cat syscall_open.stp 
#!/usr/bin/env stap
# System-wide strace-like tool for catching file open syscalls.
# Usage: stap syscall_open filename_regexp
probe syscall.open* {
  if (filename =~ @1) {
    printf("%s(%d) opened %s\n", execname(), pid(), filename)

It’s as easy as starting this up and waiting until the process is found. It accepts regular expression, not a glob:

# dnf install systemtap systemtap-runtime
# stap syscall_open.stp '/mnt/int/data.*'

This will work on all SystemTap operating systems, I tested this on Fedora and any EL distribution should work too.

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