gstat information on the CLI

Eduardo Meyer dudu.meyer at
Thu Oct 23 10:16:27 PDT 2008

On Thu, Oct 23, 2008 at 1:52 PM, Jeremy Chadwick <koitsu at> wrote:
> On Thu, Oct 23, 2008 at 01:11:55PM -0200, Eduardo Meyer wrote:
>> On Thu, Oct 23, 2008 at 12:50 PM, Jeremy Chadwick <koitsu at> wrote:
>> > On Thu, Oct 23, 2008 at 12:20:45PM -0200, Eduardo Meyer wrote:
>> >> Hello,
>> >>
>> >> Its me again bothering you with basic things I cant accomplish.
>> >>
>> >> I am planning on monitoring my disks, and the most important
>> >> information for me is thorughput and lengh queue of operations. I can
>> >> get the first information with iostat -w1 and sorta, which is perfect
>> >> for scripting.
>> >>
>> >> However, I also need the L(q) information which FreeBSD gives me with
>> >> gstat. However, this curses interface wont allow me to use grep+awk to
>> >> get the information I need for the device (slices and disks, but not
>> >> labels) I need.
>> >
>> > Can you tell me what the L(q) field actually represents in gstat?
>> >
>> > The BUGS section of the gstat man page should indirectly answer your
>> > other question (re: non-curses).
>> Yes, I have read that. I am looking the source code for gstat. Its
>> simple, small and clear. I guess can be asily modified to have what I
>> want :)
>> >> So I ask, how can I get this information other than gstat? Or, can
>> >> gstat work in non-interactive mode?
>> >
>> > iostat -x should provide what you're looking for.  And remember, the
>> > first sample data shown in iostat should be generally discarded.
>> I need the queue lengh of pending disk operations. What L(q) shows is
>> the lengh queue, the queued number of pending operations (I believe).
> It isn't documented, so I really have no idea what it means, hence my
> question.  I'm curious why you're interested in that number; why does it
> matter?
> iostat -x provides the same kind of value, and you won't have to modify
> any code to get what you need:
>           wait    transactions queue length

Jeremy, thank you.

They show the same information, reading the code I see both show
DSM_QUEUE_LENGHT from devstat_compute_statistics().

Thanks again :)

Eduardo Meyer
pessoal: dudu.meyer at
profissional: ddm.farmaciap at

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