SCSI MIB draft and UML model

ericson_george at emc.com ericson_george at emc.com
Tue Jan 8 11:36:45 PST 2002


* From the T10 Reflector (t10 at t10.org), posted by:
* ericson_george at emc.com
*
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Yaron,

I have a number of questions on your visio diagram.  I've included another
visio to help with my comments.  I apologise in advance if some of these
questions are a result of SNMP and should be obvious to an SNMP expert.

1) Your comment on SCSIInstance is that it is a top-level object to which
everything else belongs.  However, looking at the properties in your other
instances, I think it should be the top-level superclass from which
everything else inherits.  The enclosed makes that assumption and doesn't.
(Note, I don't show inherited properties.)

2) What is a ScsiTargetTransport?  In the enclosed, I used a direct link
|from Target/InitiatorPort to Target/InitiatorDevice.  Is that sufficient?

3) The Attached Target/Initiator Port structures seem complex.  I tried
using ScsiInterconnect instead.  

4) The Target/Initiator Access structures seem complex.  I tried using
ScsiAccess instead, (modeled after the common information model (CIM)
implementation).  

5) A SCSI Device may be both a Target and an Initiator.  But we want to
avoid multiple inheritance, so I added ScsiComboDevice in the enclosed.

6) A SCSI Port may be both a Target and an Initiator.    But we want to
avoid multiple inheritance, so I added ScsiComboPort in the enclosed.

7) I added BusId to ScsiPort.  This is the name of the port as seen from
within the ScsiDevice. 

8) I took the liberty of subclassing LogicalUnit from TargetDevice.  This is
not discussed in SAM-2, but I believe it works.  Subclassing LU from Target
has the advantage of simplifying the simple case, (say a disk drive.)  As
well, it actually enables modeling a SAM2 hierarchical device.

Regards,
George Ericson 
EMC Corporation < http://www.emc.com/>
Storage Platforms Operations, Advanced Technology
21 Coslin Drive, Southboro, MA 01772
Office: (508) 382-7349; Mobile: (508) 498-8461; Fax: (508) 382-7913








> -----Original Message-----
> From: Yaron Lederman [mailto:yaronl at siliquent.com]
> Sent: Tuesday, January 08, 2002 6:07 AM
> To: t10 at t10.org
> Cc: Elizabeth Rodriguez (E-mail); George Penokie; Keith McCloghrie
> (E-mail); Kha Sin Teow (E-mail); MARJORIE KRUEGER (E-mail); Mark Bakke
> (E-mail); Michele Hallak - Stamler (E-mail); Roger Cummings (E-mail);
> Sajay Selvaraj (E-mail); T11; Yaron Lederman
> Subject: SCSI MIB draft and UML model
> 
> 
> * From the T10 Reflector (t10 at t10.org), posted by:
> * Yaron Lederman <yaronl at siliquent.com>
> *
> Find enclosed the location for the SCSI MIB draft and UML model. They
> will be discussed at the upcoming T10 meeting. The T10 meeting map has
> SCSI MIB and T10 Editor's meeting sharing a room.  The SCSI 
> MIB meeting
> is Jan 14, 9am-2pm 
> 
> ftp://ftp.t11.org/other/scsimib/Posting 
> 
> enjoy
> Yaron
> *
> * For T10 Reflector information, send a message with
> * 'info t10' (no quotes) in the message body to majordomo at t10.org
> 



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