I_T nexus loss

Kevin D Butt kdbutt at us.ibm.com
Wed Sep 24 13:01:47 PDT 2008

Formatted message: <A HREF="r0809241_f.htm">HTML-formatted message</A>

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.
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 at us.ibm.com
Shawn Authement <Shawn.Authement at texmemsys.com>
t10 at t10.org
09/24/2008 12:17 PM
I_T nexus loss
* From the T10 Reflector (t10 at t10.org), posted by:
* Shawn Authement <Shawn.Authement at texmemsys.com>
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 at texmemsys.com
ph: +1.713.266.3200
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org

More information about the T10 mailing list