RE: iSCSI MIB Object Model

[Venkat Rangan <venkat@rhapsodynetworks.com>]

Mark,

The UML is very nice, and the new object model, covering both
Initiator and Target instances is also nice.

Overall, we do have some concern over the need for maintaining per-LU and
per-LUN statistics. In some iSCSI implementations, the iSCSI entity is
merely an intermediate layer, with no knowledge of LUs and LUNs. Placing
this in the GeneralInfo category and making it mandatory would add undue
burden on these implementations.

In Section 5.9:
   "The iscsiLUTable contains a list of iSCSI Logical Units that are
   accessible via the iSCSI target."

Would this list be the same as what the "Report LUNs" command would give?

In Section 5.7:
   "The iscsiLunTable contains an entry for each known LUN that is being
   accessed using this session.  Note that is may not contain all of the
   LUNs that could be accessed; the only ones available to iSCSI are the
   ones that have been addressed specifically by iSCSI commands.
   Therefore, LUNs that have been discovered via mechanisms such as the
   SCSI "report LUNs" will not appear in this table until they are
   specifically addressed by the initiator.

How long do these entries live in the table? If iSCSI sessions logout and
close, do these entries continue to remain?

Thanks,

Venkat Rangan
Rhapsody Networks Inc.
http://www.rhapsodynetworks.com



-----Original Message-----
From: Mark Bakke [mailto:mbakke@cisco.com]
Sent: Monday, March 12, 2001 7:12 AM
To: IPS
Subject: iSCSI MIB Object Model



iSCSI MIB enthusiasts-

While building the iSCSI MIB table structure, we created a
UML (more or less) model for iSCSI, from which the MIB was
derived.  Julian has placed a pdf of the model on his web
site; it is available at:

http://www.haifa.il.ibm.com/satran/ips/Visio-iscsi-uml-model-02.pdf

The UML model does not show every table and attribute; it is
meant as a higher-level abstraction, and should be helpful in
reading the MIB, or in understanding how the iSCSI objects
relate to one another.  It has been updated to include a few
fields that are missing in the current draft.

Also available, for those who do not have the previous messages:

iSCSI MIB table structure

http://www.haifa.il.ibm.com/satran/ips/iscsi-mib-structure-02.pdf

iSCSI MIB (zipped version)

http://www.haifa.il.ibm.com/satran/ips/draft-bakke-iscsimib-02.zip

iSCSI MIB (uncompressed)

http://www.haifa.il.ibm.com/satran/ips/draft-bakke-iscsimib-02.txt

Enjoy,

-- 
Mark A. Bakke
Cisco Systems
mbakke@cisco.com
763.398.1054