Tracking if disk is busy

Dan Nelson dnelson at
Thu Jun 22 23:29:49 UTC 2006

In the last episode (Jun 22), Matt Ruzicka said:
> We've got a couple servers that appear to have particularly busy
> disks and I was trying to determine if there is a way to more easily
> poll this data for tracking.
> I'm not sure if this is one of those can't see the forest for the
> trees issues or not, but the only means that I am familiar with to
> see the percentage of time the disk is busy is to run 'systat
> -vmstat'.  I was hoping for something more concise that I could run
> periodically and maybe even graph (realizing that watching this might
> well distort the results).
> It appears that iostat on Solaris gives this information, but I can't
> seem to mimic this functionality with FreeBSD.

iostat on -current and 6-stable has a Solaris-style -x mode with a
percent-busy column.

	Dan Nelson
	dnelson at

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