To: blackmagic02881@gmail.com
Cc: Arne Redlich <agr@powerkom-dd.de>, Juhani Rautiainen <jrauti@iki.fi>,
   owner-t10@t10.org, "Ross S. W. Walker" <rwalker@medallion.com>,
   Steffen Plotner <swplotner@amherst.edu>, t10@t10.org
Subject: Re: question about reservation and persistent reservation
From: George Penokie <gop@us.ibm.com>
Date: Tue, 2 Jan 2007 08:27:17 -0600
X-Message-Number: 7455
Formatted message: HTML-formatted message

Ming,
Reservations and persistent reservations are both I_T nexus based. The 
question that has to be answered is; What has the iSCSI protocol defined 
as the initiator port (i.e., the I) and the target port (i.e., the T). 
>From SAMs point of view as long as the connection is between the same I 
and T that holds the reservation then the command is valid regardless of 
the actual physical path that is used (i.e., there can be any number of 
physical paths between a single initiator port and a single target port).
Bye for now,
George Penokie
Dept 9A8 030-3 A410
E-Mail:    gop@us.ibm.com
Internal:  553-5208
External: 507-253-5208
Ming Zhang <blackmagic02881@gmail.com> 
Sent by: owner-t10@t10.org
12/28/2006 10:21 AM
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Arne Redlich <agr@powerkom-dd.de>, Juhani Rautiainen <jrauti@iki.fi>, 
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Subject
question about reservation and persistent reservation
* From the T10 Reflector (t10@t10.org), posted by:
* Ming Zhang <blackmagic02881@gmail.com>
*
Hi All
We try to add reservation support to an iSCSI target and have some
questions about reservation.
Reservation is per nexus or per initiator? persistent reservation is per
nexus or per initiator?
Our dilemma is like this. between an iSCSI initiator and target,
multipath IO can (1) has multiple sessions over to same target via
different physical NICs and paths. or (2) has one session with multiple
connections, with each connection over different paths. Base on iSCSI
RFC, (1) will have multiple I_L nexus while (2) only have 1 nexus.
Then for reservation support via RESERVE_6/10, if one initiator reserve
one LU via one session, can this initiator send WRITE or other commands
via another session?
Thanks
Ming
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