To: Shawn Authement <Shawn.Authement@texmemsys.com>
Cc: t10@t10.org
Subject: Re: I_T nexus loss
From: Kevin D Butt <kdbutt@us.ibm.com>
Date: Wed, 24 Sep 2008 13:01:47 -0700
X-Message-Number: 9126
Formatted message: HTML-formatted message

Shawn,
Yes, when an N_Port performs a PLOGI/PRLI it logs in again.  This can be 
viewed as an implicit LOGO/PRLO and as stated in 4.11 of FCP-4 (
http://www.t10.org/ftp/t10/drafts/fcp4/fcp4r01.pdf) this generates an I_T 
nexus loss notification.
Regards,
Kevin D. Butt
SCSI & Fibre Channel Architect, Tape Firmware
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-2869 / 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt@us.ibm.com
http://www-03.ibm.com/servers/storage/ 
From:
Shawn Authement <Shawn.Authement@texmemsys.com>
To:
t10@t10.org
Date:
09/24/2008 12:17 PM
Subject:
I_T nexus loss
* From the T10 Reflector (t10@t10.org), posted by:
* Shawn Authement <Shawn.Authement@texmemsys.com>
*
All,
I am currently researching device behavior with respect to N_Port login 
and was wondering if anyone can provide clarification.
Q: If an already-logged-in N_Port performs login again (via PLOGI), is 
this considered an I_T nexus loss as defined by SAM-3, 6.3.4?
The ENDL Fibre Channel Bench Reference implies that re-Login causes an 
implicit Logout.  However, I cannot find any supporting information in 
either the FCP-3 for FC-LS specifications.  My goal is to ultimately 
determine whether a SCSI Target Port should set a Unit Attention if a 
SCSI Initiator Port re-logs in.
Thank you for your your help!
-- 
Shawn Authement
Sr. Software Engineer
Texas Memory Systems, Inc.
Shawn.Authement@texmemsys.com
ph: +1.713.266.3200
*
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