Date: Sun, 09 Apr 2006 10:01:56 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Mike Meyer <mwm-keyword-freebsdhackers.102a7e@mired.org> Cc: hackers@freebsd.org Subject: Re: Using any network interface whatsoever Message-ID: <4438CD84.1020906@infracaninophile.co.uk> In-Reply-To: <17464.29347.529203.354768@bhuda.mired.org> References: <C05CAC06.C0BD%ceri@submonkey.net> <20060407225742.GA21619@odin.ac.hmc.edu> <20060407230247.GH16344@submonkey.net> <4437C9F6.5000008@samsco.org> <20060408233740.GA84768@submonkey.net> <44384A55.2010103@samsco.org> <4438630E.4090300@deadcafe.de> <17464.29347.529203.354768@bhuda.mired.org>
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Mike Meyer wrote:
> In <4438630E.4090300@deadcafe.de>, Daniel Rock <freebsd@deadcafe.de> ty=
ped:
>> So I doubt that the overwriting of an Ingres database really
>> happened in Solaris, like some other poster described - unless the
>> administrator fiddled with /etc/path_to_inst by hand (you are free
>> to shoot in your own foot).
>=20
> That happened very early in the life of Solaris, in the early 90s.
> Persistent numbering was added to Solaris in response to this incident
> (there were probably others as well).
>=20
> This was on a relatively large server, with something like 4 SCSI
> buses. A drive was added to a previously unused bus, making it appear
> "between" two drives that were already in the system. This gave all
> the drives further on in the probe sequence a device number one higher
> than they had previously had.
It sounds for me as if you (Mike Meyer) are asking for something like
'acpidump -d' or 'pciconf -l -v' output, but translated into a filesystem=
abstraction -- ie a tree of directories corresponding to different busses=
containing device files ordered according to the bus slot they are
plugged into. This would be something that you can use either in place
of the traditional /dev or as an adjunct to it. I believe Solaris has
a /devices tree which does essentially this.
In practice however on the systems we deploy we know that the principal
network interfaces are the ones on-board the motherboard, and we know
that em0 or bge0 is the one closest to the PSU. Similarly for other
devices -- disk device numbers can be deduced from the physical slot they=
are in. Sure it's just a convention, and it helps that the equipment
supplier we use is very consistent about such things, and that in general=
we don't go around plugging USB disk devices into server systems that
frequently. But on the whole it works.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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