linux-kernel - Re: What still uses the block layer?

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Message-ID: <4713A705.60403@garzik.org>
Date:	Mon, 15 Oct 2007 13:44:37 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Theodore Tso <tytso@....edu>, Rob Landley <rob@...dley.net>,
	James Bottomley <James.Bottomley@...eleye.com>,
	Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, Jens Axboe <axboe@...e.de>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Nick Piggin <piggin@...erone.com.au>
Subject: Re: What still uses the block layer?

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.

WWN was added in ATA-7, AFAICS.

However, I've seen quite a few ATA-7 devices that do not bother to fill 
it in.  I wonder if ATA-8 device firmwares will act with similar 
slackness.  :)

	Jeff



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