DTrace (or other monitor) access to LBA of a block device

[Mateusz Marzantowicz]

On Thu, Dec 2, 2010 at 10:33 PM, Thomas Zander <
thomas.e.zander at googlemail.com> wrote:

> Hi,
>
> do we have any way to monitor which LBAs of which block device are
> read/written at a given time?
>
> I stumbled upon this,
> http://southbrain.com/south/2008/02/fun-with-dtrace-and-zfs-mirror.html
>
> which is pretty intriguing. Unfortunately on FreeBSD we do not have
> the DTrace io provider, so his dtrace script would not work.
> Do we have another option to monitor block device access in a similar
> fashion?
>
> Regards,
> Riggs
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I'm happy FreeBSD user and not a developer but as far as I know (see:
http://www.freebsd.org/doc/en/books/arch-handbook/driverbasics-block.html)
there is no such thing like block device in FreeBSD. It might be possible to
do what you want in other way or with different type of device.

Regards,
Mateusz Marzantowicz