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hotspot.d(1)                    USER COMMANDS                   hotspot.d(1)




NAME

       hotspot.d - print disk event by location. Uses DTrace.


SYNOPSIS

       hotspot.d


DESCRIPTION

       hotspot.d  is  a  simple DTrace script to determine if disk activity is
       occuring in the one place - a "hotspot". This helps us  understand  the
       system's  usage  of a disk, it does not imply that the existance or not
       of a hotspot is good or bad (often may be good, less seeking).

       Since this uses DTrace, only users with root privileges  can  run  this
       command.


EXAMPLES

       Sample until Ctrl-C is hit then print report,
              # hotspot.d



FIELDS

       Disk   disk instance name

       Major  driver major number

       Minor  driver minor number

       value  location of disk event, megabytes

       count  number of events



DOCUMENTATION

       See  the  DTraceToolkit for further documentation under the Docs direc-
       tory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.


EXIT

       hotspot.d will sample until Ctrl-C is hit.


AUTHOR

       Brendan Gregg [Sydney, Australia]


SEE ALSO

       dtrace(1M)



version 0.95                     May 14, 2005                    hotspot.d(1)

Mac OS X 10.6 - Generated Thu Sep 17 20:07:49 CDT 2009
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