Date: Wed, 27 Apr 2011 03:17:18 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Pan Tsu <inyaoo@gmail.com> Cc: freebsd-fs@freebsd.org, "Jason J. Hellenthal" <jhell@DataIX.net>, dillon@backplane.com Subject: Re: Why not just name the cam-ata devices the same as the old names? Message-ID: <20110427101718.GA82324@icarus.home.lan> In-Reply-To: <864o5kgplh.fsf@gmail.com> References: <4DB70949.6090104@FreeBSD.org> <20110426182017.GA92471@freebsd.org> <4DB70F13.6060002@FreeBSD.org> <BANLkTikFHLaQ=Vrt9UhyJdo5ELm522OZjA@mail.gmail.com> <4DB759A1.4050201@FreeBSD.org> <20110427054218.GA88420@DataIX.net> <864o5kgplh.fsf@gmail.com>
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On Wed, Apr 27, 2011 at 10:44:58AM +0400, Pan Tsu wrote: > "Jason J. Hellenthal" <jhell@DataIX.net> writes: > > > I do not know if this was summed up in a easy way by Jeremy's nice > > message below but in short a summary can be made here to clear that up. > > > > /dev/gptid/* /dev/gpt/* > > * These survive its raw partition being newfs'd > > * Are only created for disks that are partitioned > > and contain a GPT table as can be seen with gpart > > show > > * Operations on these or the raw partition will not remove them. > > Not sure if we have support for labels based on disk serial number > similar to /dev/serno/* from DragonFlyBSD but > > /dev/serno/* > * no extra step to setup, e.g. `gpart create' or `newfs' > * survive wiping entire disk, no metadata stored on-disk > * available on every ata disk How is this number generated within DFBSD? I have seen hard disks that have literally no serial number (field is blank, and not space-padded either). Some systems vendors do this. I'm wondering if the generated number is based on a combination of details (ex. device model string + serial number string + total drive capacity in bytes), rather than just pure drive serial number. CC'ing Matt as he probably knows. :-) -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP 4BD6C0CB |
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