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Date:      Wed, 9 Dec 2009 11:42:31 -0800 (PST)
From:      James Phillips <anti_spam256@yahoo.ca>
To:        freebsd-questions@freebsd.org
Subject:   Re: Dangerously Dedicated (was: How do I create large ...)
Message-ID:  <675083.74248.qm@web65510.mail.ac4.yahoo.com>
In-Reply-To: <20091209002231.EB7D01065741@hub.freebsd.org>

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> Date: Tue, 8 Dec 2009 22:00:29 +0100
> From: Polytropon <freebsd@edvax.de>
> Subject: Re: How do I create large partitions in FreeBSD?
> To: krad <kraduk@googlemail.com>
> Cc: Peter Steele <psteele@maxiscale.com>,
> =A0=A0=A0 "freebsd-questions@freebsd.org"
> <freebsd-questions@freebsd.org>
> Message-ID: <20091208220029.2052102f.freebsd@edvax.de>
> Content-Type: text/plain; charset=3DUS-ASCII
>=20
> On Tue, 8 Dec 2009 20:52:52 +0000, krad <kraduk@googlemail.com>
> wrote:
> > stay away from dangerously dedicated it seems as
> though they are being
> > phased out
>=20
> I've followed the related discussion, but I'm not sure
> what
> to conclude from it... as far as I understood, creating an
> installation "dangerously dedicated" mode isn't possible
> from sysinstall anymore, but still possible via the
> command
> line tools. I don't see a reason why it is considered to
> be
> something bad, but the inclusion of a "carrier slice" for
> the OS's partitions has always been recommended. But for
> data disks where only one partition is intended, why
> create
> it inside a slice?
>=20

I sort of followed the discussion as well. There was some=20
disagreement about what "dangreously dedicated" means. Does it mean=20
getting rid of the DOS partition table (slices?)  Or, does it mean=20
creating a slice or disks without BSD partitions? The Handbook (18.3)=20
says: "If the disk is  going to be truly dedicated to FreeBSD, you=20
can use the dedicated mode. Otherwise, FreeBSD will have to live=20
within one of the PC BIOS partitions. FreeBSD calls the PC BIOS=20
partitions slices so as not to confuse them with traditional BSD=20
partitions."=20
The programer in charge of the change seemed to indicate that the=20
"Dangerously dedicated" mode (I assume that means no BSD partititons)=20
conflicts with "GEOM: Modular Disk Transformation Framework." GEOM=20
appears to be an asbtraction layer for accessing various disks. With=20
the move underway to start accessing all disk as SCSI(3 is device=20
independent (with translation help)) devices, it probably makes for=20
more elegant code. Handbook (19.2 GEOM Introduction) reads:
"GEOM permits access and control to classes -- Master Boot Records,=20
BSD labels, etc -- through the use of providers, or the special files=20
in /dev. Supporting various software RAID configurations, GEOM will=20
transparently provide access to the operating system and operating=20
system utilities."=20
The important thing in that quote is that "BSD labels" (and Master=20
Boot Records) are mentioned specificly.=20
Regards,

James Phillips=0A=0A=0A      ______________________________________________=
____________________=0AYahoo! Canada Toolbar: Search from anywhere on the w=
eb, and bookmark your favourite sites. Download it now=0Ahttp://ca.toolbar.=
yahoo.com.



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