Você pode monitorar a E / S de um dispositivo com iosnoop . Monitorando sda por exemplo:
# iosnoop -ts -d "8,0"
Tracing block I/O. Ctrl-C to end.
STARTs ENDs COMM PID TYPE DEV BLOCK BYTES LATms
340208.638093 340208.654477 rsync 10244 RM 8,0 1814496 16384 16.38
340208.654523 340208.665321 <idle> 0 RM 8,0 1814464 16384 10.80
340208.725234 340208.749223 rsync 10245 RM 8,0 86260504 4096 23.99
340208.750150 340208.756908 rsync 10245 RM 8,0 86263552 4096 6.76