RE: LU access through an iSCSI session

[Charles Monia <cmonia@NishanSystems.com>]

Hi:

Strangely enough, while we're on the subject, I don't believe SAM-xx
requires a target to present the same view of its logical units to every
initiator regardless of the number of NICs.  I suspect there may even be
products out there that exploit this "feature".

Charles


> -----Original Message-----
> From: meth@il.ibm.com [mailto:meth@il.ibm.com]
> Sent: Saturday, September 23, 2000 1:19 PM
> To: Robert Snively; ips@ece.cmu.edu
> Subject: RE: LU access through an iSCSI session
> 
> 
> 
> 
> 
> There should be no problem. It is similar to the case where 
> there are 2
> different SCSI busses connecting a host to a controller. Each 
> iSCSI session
> is like a separate virtual SCSI bus. The LU names for the 
> same device that
> is reached via the different paths may be different. The way 
> for the host
> to tell that they are actually the same device is though the 
> Vital Product
> Data, which uniquely identifies the LU.
> 
> - Kalman
> 
> Robert Snively <rsnively@Brocade.COM> on 21/09/2000 18:42:44
> 
> Please respond to Robert Snively <rsnively@Brocade.COM>
> 
> To:   Kalman Meth/Haifa/IBM@IBMIL, Pierre Labat <pierre_labat@hp.com>,
>       ips@ece.cmu.edu
> cc:
> Subject:  RE: LU access through an iSCSI session
> 
> 
> 
> 
> 
> >  LU numbers are identical across all of the TCP connections of a
> >  single iSCSI session.
> 
> This is an intriguing concept.  At present, SCSI does not require
> logical units to have the same LUN if they are accessed through
> different NICs.  However, present SCSI is essentially one NIC 
> per session.
> 
> If you have an iSCSI session using NIC A and NIC B and a 
> second session
> using NIC B and NIC C as physical paths, by this definition,
> NIC B could have two different LUNs for the same logical unit, one
> from each session.
> 
> That should not be a problem, right?
> 
> 
> 
>