Date: Thu, 24 Feb 2011 16:07:15 +0300 From: Pavel Sukhoy <sukhoy@nic.ru> To: Sergey Kandaurov <pluknet@gmail.com> Cc: freebsd-doc@freebsd.org Subject: Re: "Handbook / Chapter 19 GEOM" question Message-ID: <201102241606.42699.sukhoy@nic.ru> In-Reply-To: <AANLkTi=_HjY-dXEH0U4FODstaToJj3WnOcQtSbj1VOFw@mail.gmail.com> References: <201102241458.45129.sukhoy@nic.ru> <AANLkTi=_HjY-dXEH0U4FODstaToJj3WnOcQtSbj1VOFw@mail.gmail.com>
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On Thursday 24 of February 2011 15:47:15 Sergey Kandaurov wrote:
> 2011/2/24 Pavel Sukhoy <sukhoy@nic.ru>:
> > Hello all,
> >
> > Could you tell me some clarifications about section "19.4.1 Mirroring Primary Disks"?
> >
> > In this section I see sample command:
> >
> > # sysctl kern.geom.debugflags=17
> >
> > but I can't understand why this kernel tunable should be 17?
> >
> > If I will look through the /usr/src/sys/geom/geom_kern.c
> >
> > I will see this:
> > "...
> > TUNABLE_INT("kern.geom.debugflags", &g_debugflags);
> > ..."
> >
> > and in /usr/src/sys/geom/geom_subr.c
> >
> > I will see this:
> > "...
> > /* If foot-shooting is enabled, any open on rank#1 is OK */
> > if ((g_debugflags & 16) && pp->geom->rank == 1);
> > ..."
> >
> > So I think that it should be 16 or I looked for it in inappropriate files.
> >
>
> 17 additionally enables the first bit to trace G_T_TOPOLOGY events.
> There is a full list in geom/geom_int.h:
> /*
> * 1 G_T_TOPOLOGY
> * 2 G_T_BIO
> * 4 G_T_ACCESS
> * 8 (unused)
> * 16 Allow footshooting on rank#1 providers
> * 32 G_T_DETAILS
> */
>
>
Thanks a lot.
--
With best regards,
Pavel Sukhoy
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