hotspot.d(1m) USER COMMANDS hotspot.d(1m)
hotspot.d - print disk event by location. Uses DTrace.
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
Sample until Ctrl-C is hit then print report,
Disk disk instance name
Major driver major number
Minor driver minor number
value location of disk event, megabytes
count number of events
See the DTraceToolkit for further documentation under the Docs directory.
The DTraceToolkit docs may include full worked examples with verbose
descriptions explaining the output.
hotspot.d will sample until Ctrl-C is hit.
Brendan Gregg [Sydney, Australia]
version 0.95 May 14, 2005 hotspot.d(1m)