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  • You can in fact monitor sync progress. Commented Apr 26, 2017 at 9:58
  • Yes, but only as a summary for all drives present in the system - I'd like to be able to do this for each individual block device. Commented Apr 26, 2017 at 10:35
  • atop and iostat give I/O activity by block device, so I always assumed this ignores internal caches and only measures "real" I/O. Commented Apr 26, 2017 at 12:36
  • Even if atop and iotop gave physical write and read speeds - they a re still just speeds, I need to know the amount of data that has been written, I can calculate xfer speed later if I need it. For a cached write atop reports a steady write speed of around 9.7 MB/s. That makes me think it is physical write speed, not the caching speed (as I can see there's several hundreds of MB in the cache still (that the system normally considers as already written - which is not true). Commented Apr 27, 2017 at 8:08