From: Theodore Tso <tytso@mit.edu>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Rob Landley <rob@landley.net>,
James Bottomley <James.Bottomley@steeleye.com>,
Matthew Wilcox <matthew@wil.cx>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
Jens Axboe <axboe@suse.de>,
Suparna Bhattacharya <suparna@in.ibm.com>,
Nick Piggin <piggin@cyberone.com.au>
Subject: Re: What still uses the block layer?
Date: Mon, 15 Oct 2007 09:35:50 -0400 [thread overview]
Message-ID: <20071015133549.GF21216@thunk.org> (raw)
In-Reply-To: <20071015142945.2cb27911@the-village.bc.nu>
On Mon, Oct 15, 2007 at 02:29:45PM +0100, Alan Cox wrote:
> > You can pull a Model and Serial number via hdparm -i, but it's not as
> > easy to manipulate as a fixed-length MAC address. That's why people
> > tend to use filesystem UUID's.
>
> ATA8 at the moment looks set to add a true "MAC" or "WWN" type identifier
> to each device.. Right now model/serial is not always unique.
True, but most manufacturers try to make the serial number unique for
their own reasons (like warrantee service), and you can have
manufacturing errors with MAC assignment just as easily as you can
with serial numbers.
I still remember when SGI shipped MIT 20 SGI Indy pizza boxes that all
had the same MAC addresses (that we knew about --- we found out
because all 20 were installed on the same subnet). That was a mildly
entertaining bug to track down.... especially since IIRC, Irix at the
time didn't print warning messages when someone else with a different
IP addresses responded to your MAC address.
- Ted
next prev parent reply other threads:[~2007-10-15 13:36 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-12 1:11 What still uses the block layer? Rob Landley
2007-10-13 22:05 ` Matthew Wilcox
2007-10-14 5:54 ` David Newall
2007-10-14 17:46 ` Stefan Richter
2007-10-14 22:35 ` Tilman Schmidt
2007-10-14 23:36 ` Rob Landley
2007-10-15 1:23 ` Neil Brown
2007-10-15 5:44 ` Stefan Richter
2007-10-15 9:26 ` Rob Landley
2007-10-15 16:08 ` Matthew Wilcox
2007-10-15 17:10 ` Stefan Richter
2007-10-16 3:06 ` david
2007-10-16 5:56 ` Stefan Richter
2007-10-16 10:19 ` Alan Cox
2007-10-16 19:54 ` david
2007-10-16 19:54 ` Matthew Wilcox
2007-10-16 20:18 ` Stefan Richter
2007-10-16 20:34 ` Theodore Tso
2007-10-16 20:56 ` Stefan Richter
2007-10-16 20:55 ` david
2007-10-16 21:49 ` Alan Cox
2007-10-17 9:48 ` Gabor Gombas
2007-10-17 17:23 ` Stefan Richter
2007-10-17 21:04 ` david
2007-10-15 20:29 ` Wilfried Klaebe
2007-10-14 22:24 ` James Bottomley
2007-10-14 23:45 ` Rob Landley
2007-10-15 1:45 ` Theodore Tso
2007-10-15 8:04 ` Rob Landley
2007-10-15 9:06 ` Julian Calaby
2007-10-15 10:08 ` Rob Landley
2007-10-15 17:33 ` Greg KH
2007-10-16 2:54 ` david
2007-10-16 4:04 ` Matthew Wilcox
2007-10-16 4:11 ` Arjan van de Ven
2007-10-16 4:15 ` david
2007-10-16 4:21 ` Greg KH
2007-10-16 5:00 ` david
[not found] ` <646765f40710150327i78519a0fvaea7a83d5975b180@mail.gmail.com>
[not found] ` <200710151511.29748.rob@landley.net>
2007-10-15 23:49 ` Julian Calaby
2007-10-15 10:32 ` Loïc Grenié
2007-10-15 21:09 ` Rob Landley
2007-10-15 11:19 ` Neil Brown
2007-10-15 21:34 ` Rob Landley
2007-10-15 21:46 ` Jeff Garzik
2007-10-15 22:01 ` Alan Cox
2007-10-15 23:41 ` Neil Brown
2007-10-16 2:12 ` david
2007-10-15 13:21 ` Theodore Tso
2007-10-15 13:29 ` Alan Cox
2007-10-15 13:35 ` Theodore Tso [this message]
2007-10-15 17:44 ` Jeff Garzik
2007-10-15 14:46 ` Douglas Gilbert
2007-10-16 2:51 ` david
2007-10-15 13:37 ` OOM killer gripe (was Re: What still uses the block layer?) Nick Piggin
2007-10-15 9:52 ` Rob Landley
2007-10-15 15:08 ` Nick Piggin
2007-10-16 6:22 ` David Newall
2007-10-20 9:48 ` Pavel Machek
2007-10-15 11:40 ` Theodore Tso
2007-10-20 9:50 ` Pavel Machek
2007-10-16 3:55 ` Eric W. Biederman
2007-10-16 4:10 ` david
2007-10-16 4:45 ` Eric W. Biederman
2007-10-16 6:59 ` Nick Piggin
2007-10-16 4:38 ` Eric W. Biederman
2007-10-16 6:38 ` Rob Landley
2007-10-16 9:31 ` Eric W. Biederman
2007-10-16 10:28 ` Alan Cox
2007-10-16 23:59 ` Rob Landley
2007-10-16 7:34 ` Nick Piggin
2007-10-18 13:00 ` Rogier Wolff
2007-10-19 6:49 ` Rob Landley
2007-10-19 7:21 ` Rogier Wolff
2007-10-16 20:37 ` Andrew Morton
2007-10-17 5:34 ` What still uses the block layer? Valdis.Kletnieks
2007-10-17 6:07 ` david
2007-10-15 6:00 ` Greg KH
2007-10-15 8:36 ` Rob Landley
2007-10-15 13:08 ` Alan Cox
2007-10-15 14:00 ` Arjan van de Ven
2007-10-15 18:56 ` Matthew Garrett
2007-10-15 17:25 ` Greg KH
2007-10-15 18:00 ` Matthew Wilcox
2007-10-15 18:46 ` Jeff Garzik
2007-10-16 6:33 ` Stefan Richter
2007-10-17 23:43 ` Bill Davidsen
2007-10-15 22:54 ` Rob Landley
2007-10-15 8:52 ` Christoph Hellwig
2007-10-15 13:10 ` James Bottomley
2007-10-15 21:51 ` Rob Landley
2007-10-15 0:45 ` Luben Tuikov
2007-10-15 6:51 ` Rob Landley
2007-10-15 8:37 ` Luben Tuikov
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