RE: [PATCH RFC 0/9] [SCSI] Enhanced sense and Unit Attention handling

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> -----Original Message-----
> From: linux-scsi-owner@xxxxxxxxxxxxxxx [mailto:linux-scsi-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Jeremy Linton
> Sent: Monday, January 28, 2013 10:05 AM
> To: Bart Van Assche
> Cc: Hannes Reinecke; Ewan D. Milne; linux-scsi@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH RFC 0/9] [SCSI] Enhanced sense and Unit Attention
> handling
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On 1/24/2013 8:38 AM, Bart Van Assche wrote:
> 
> > Let me ask this another way. SAN users expect that the LUN list at the
> > initiator side gets updated automatically after a SAN configuration change.
> > How should a SAN system communicate to a SCSI initiator that the LUN
> > list has been changed ? Some FC SAN systems send a LIP after a
> > configuration change to force the initiator to rescan LUNs. But how to
> 
> 	What I think your looking for is RSCN (Registered State Change
> notification) . Hook that, and then check the name server. This will tell you
> when ports get added/removed. You can then report luns against lun 0 of all
> the known target ports. This allows you to transparently detect changes.

iSNS based SCN registrations - Open iSCSI facilitates a subset of such SCNs.

http://linux.dell.com/files/presentations/Red_Hat_Summit_2009/Simplifying_Linux_iSCSI_management_with_iSNS-v0.7.pdf

Now if you want SCSI to do SCN registrations that will be a topic to discuss.. though I would say we don't go down that path..

Since both FC/FCoE and iSCSI can register with an iSNS/SNS server this should solve it atleast for the login/logout scenario.



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