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Old 07-16-2009, 05:59 PM   #1
Registered: Aug 2003
Posts: 51

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atop - what is a busy disk

I'm monitoring a machine with atop and it is showing that the disk sdb is 80% busy.
What exactly does that mean? How is 80% busy actually calculated?

Old 07-16-2009, 06:13 PM   #2
Registered: Jul 2009
Location: Illinois, US
Distribution: Fedora 11
Posts: 374

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From `man atop`:

       DSK  Disk utilization.
            Per  active  disk  one  line is produced, sorted on disk activity.
            Such line shows the name of the disk (e.g. hda or sda),  the  busy
            percentage  i.e.  the  portion of time that the disk was busy han-
            dling requests  (‚busy‚),  the  number  of  read  requests  issued
            (‚read‚),  the  number  of write requests issued (‚write‚) and the
            average number of milliseconds needed by a  request  (‚avio‚)  for
            seek, latency and data transfer.
That's a sufficient answer for me. If you want to know more about how it calculates that (that seems beyond the abilities of /proc), you may need to dig into the source or dev mailing lists.


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