Re: iSCSI: multiple sessions b/n a pair of WWUIs.

[Santosh Rao <santoshr@cup.hp.com>]

Jim,

I agree that the only requirement is uniqueness of ISID among all the
sessions to a given target node. Maintaining uniqueness across all
targets only extends compliance to this requirement a step further and
does not violate it.

All we are debating is David's suggestion that a note could be added to
indicate that implementations may choose to apply this uniqueness across
all target nodes so as to use the ISID as a target lookup mechanism.

If there is strong resistance against adding such a note, then, let us
omit it. [as long as the spec does'nt preclude usage of ISID as unique
across all targets].

Regards,
Santosh


Jim Hafner wrote:
> 
> Santosh,
> 
> As I've said, I agree with the sentiment, but that is not the only
> implementation option.  For example, why can't the database index on the
> pointer to the data structure that has the names, etc, or hash on the names
> or a million other things.  We shouldn't spec implementations, only
> interoperability requirements.
> 
> Jim Hafner
> 
> Santosh Rao <santoshr@cup.hp.com>@ece.cmu.edu on 05-08-2001 11:03:27 AM
> 
> Sent by:  owner-ips@ece.cmu.edu
> 
> To:   ips@ece.cmu.edu
> cc:
> Subject:  Re: iSCSI: multiple sessions b/n a pair of WWUIs.
> 
> Douglas Otis wrote:
> 
> >  The usefulness of ISID is also
> > diminished if the client is not expected to maintain this value as unique
> > across all Targets.
> 
> I agree with the above and have stated to similar effect in my response
> to Matt. A practical usage of ISID within an initiator node name space
> is to assign it as unique across all targets, allowing the same ISID to
> be used as a lookup key of the session for any given target port/node.
> 
> Not applying uniqueness in ISID assignment across all targets would then
> require initiators to implement a second key mechanism for target
> lookup.
> 
> - Santosh
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