The error means just what it says: there is no field named dev_statname.
Did you mean device_name ?

On Wed, Feb 12, 2020 at 1:30 PM Arun Varghese (arvarghe) via freebsd-dtrace
<[email protected]> wrote:

> Hi ,
>
>
>
> Can someone help me with this erro on freebsd 10.4 ?
>
> ./dtrace -qs iosnoop.d
>
> dtrace: failed to compile script iosnoop.d: line 10: dev_statname is not a
> member of struct devstat
>
> Regards
> Arun Varghese
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