Question on Scope: 8-byte vs 2-byte LUNs

George Penokie gop at us.ibm.com
Wed Apr 8 12:51:05 PDT 1998


* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* George Penokie <gop at us.ibm.com>
*
I think this bounced so I am sending in again.

Ralph,
I assume asking the IBM George not the DG George this question, although I
think the DG George may have also have an opinion on this. Yes I agree it makes
sense to limit REPORT LUNs to the first level. But I am not sure how to put
that in the standards. I think the best we could do would be to put a
recommendation in the REPORT LUNs command that application clients only issue
it to target:LUN=0 devices. This would prevent it from being issued to devices
in the lower levels.
Bye for now,
George


owner-t10 at Symbios.COM on 04/07/98 08:26:21 AM
Please respond to owner-t10 at Symbios.COM
To: T10 at Symbios.COM
cc:
Subject: Re: Question on Scope: 8-byte vs 2-byte LUNs


* From the T10 (formerly SCSI) Reflector (t10 at symbios.com), posted by:
* ROWEBER at acm.org
*
George,

You've hit on the main point I would have brought up, if I'd been able
to type faster.  The output from the REPORT LUNS command cannot be used
as input to the applicable SCC commands that configure virutal units.

Now that you've worked through all of that, my only remaining issue
concerns recommendations for how application clients should use the
REPORT LUNS command.  When an application client sends a REPORT LUNS
command to a level other than the one it can address directly, the
application client runs the risk of "seeing" levels of the hierarchy
it cannot address.  My preference would be to suggest that the REPORT
LUNS command never be passed through to lower levels and/or that
application clients never sent REPORT LUNS commands to lower levels.

Since we now know that the REPORT PERIPHERAL DEVICE service action
must be used for configuration purposes, there should be no need to
pass the REPORT LUNS command to lower levels.

What do you think?

Ralph...
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