Date: Thu, 24 Feb 2011 15:47:15 +0300 From: Sergey Kandaurov <pluknet@gmail.com> To: Pavel Sukhoy <sukhoy@nic.ru> Cc: freebsd-doc@freebsd.org Subject: Re: "Handbook / Chapter 19 GEOM" question Message-ID: <AANLkTi=_HjY-dXEH0U4FODstaToJj3WnOcQtSbj1VOFw@mail.gmail.com> In-Reply-To: <201102241458.45129.sukhoy@nic.ru> References: <201102241458.45129.sukhoy@nic.ru>
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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
*/
--
wbr,
pluknet
help
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