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Date: Thu, 10 May 2007 09:07:13 -0600
From: Scott Long <scottl@samsco.org>
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To: Pawel Jakub Dawidek <pjd@freebsd.org>
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Cc: freebsd-scsi@freebsd.org
Subject: Re: SCSI disk serial number.
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Pawel Jakub Dawidek wrote:
> Hi.
> 
> Can someone confirm this is the right thing to do to get SCSI disk
> serial number?
> 
> 	http://people.freebsd.org/~pjd/patches/scsi_da_ident.patch
> 
> Thanks in advance!
> 
> Can someone help me with other drivers?
> 

The serial number that CAM obtains comes from a page 0x80 inquiry.  It
is known to be rather unreliable in its uniqueness.  The SCSI spec
allows the target to return a non-zero length of all 0x20 characters if
it so desires.  Most applications that need a unique drive identifier
try to obtain the WWN from page 0x83 instead, and fall back to
hueristics with page 0x80 if that fails.

Scott