iSCSI: New Suggested Wordage to cover TPGTs

["John Hufferd" <hufferd@us.ibm.com>]

The Naming and Discovery Team (NDT) and Julian, have had meetings on the
issue
of TPGT. These meetings were to address the TPGT issue express on this
reflector.  The following is the recomendation of the extended NDT:

In section 4.3 (possibly as the last paragraph on page 63 of rev11) -

The first Login Response PDU during the Login phase from the iSCSI target
SHOULD return the TargetPortalGroupTag key that contains the tag value of
the iSCSI portal group servicing the the Login Request PDU.  If the iSCSI
target implementation supports altering the portal group configuration
(including adding, deleting, and swapping of portals in a portal group), it
MUST return the TargetPortalGroupTag key carrying the tag value of the
servicing portal group. If the reconfiguration of iSCSI portal groups is a
concern in a given environment, the iSCSI initiator MUST use this key to
ascertain that it had indeed initiated the Login phase with the intended
target portal group.


In chapter 11 (possibly as section 11.5) -

11.5  TargetPortalGroupTag

Use: IO by target, Declarative
Senders: Target
Scope: SW

TargetPortalGroupTag=<integer-from-0-to-65535>

Examples:
TargetPortalGroupTag=1

Target portal group tag is a 16-bit integer that uniquely identifies a
portal group within an iSCSI target node.  This key carries the value of
the
tag that is servicing the Login request.  The iSCSI target returns this key
to the initiator in the first Login Response PDU.
For the complete usage expectations of this key, refer to section 4.3.


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John L. Hufferd
Senior Technical Staff Member (STSM)
IBM/SSG San Jose Ca
Main Office (408) 256-0403, Tie: 276-0403,  eFax: (408) 904-4688
Home Office (408) 997-6136, Cell: (408) 499-9702
Internet address: hufferd@us.ibm.com