Clarification on SES-3 OTHER ELEMENT INDEX

Elliott, Robert (Server Storage) Elliott at hp.com
Fri Aug 12 09:33:58 PDT 2011


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1108121_f.htm">HTML-formatted message</a>

All the element index fields are absolute... it's not the index relative to
only certain types.
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Alan Westbury
Sent: Friday, 12 August, 2011 9:30 AM
To: t10 at t10.org
Subject: Clarification on SES-3 OTHER ELEMENT INDEX
Hi T10,
We are looking at the definition of the OTHER ELEMENT INDEX field as used in
the Additional Element Status diagnostic page.
This field is used in the Expander Phy Descriptor (and Phy Descriptor for the
SCSI Intiator/Target Ports) and is described as follows:
"The OTHER ELEMENT INDEX field indicates the index of a Device Slot element
(see 7.3.2), Array Device Slot element (see 7.3.3), SAS Expander element (see
7.3.25), SCSI Initiator Port element (see 7.3.23), SCSI Target Port element
(see 7.3.22), or Enclosure Services Controller Electronics element (see
7.3.9) to which the expander phy is attached. If the expander phy is not
attached to one of those elements, then the OTHER ELEMENT INDEX field shall
be set to FFh."
My question is how is the application client supposed to determine the type
of the Other Element?  In other words if the OTHER ELEMENT INDEX has a value
of N - is that the (N+1)th Array Device Slot element, SAS expander element
etc?
Wouldn't it be better if the definition was along the lines of the ELEMENT
INDEX used elsewhere in this page?
"The ELEMENT INDEX field indicates the index of the status element that this
descriptor is describing. The index is based on the position of the status
element in the Enclosure Status diagnostic pages (see 6.1.4) relative to all
other individual status elements. It does not include the overall status
elements."
Thanks and Regards,
Alan
---
Alan Westbury
Product Architect
Xyratex
Storage Systems,
Langstone Road, Havant, PO9 1SA
United Kingdom
Email: alan_westbury at xyratex.com<mailto:alan_westbury at xyratex.com>
http://www.xyratex.com<BLOCKED::http://www.xyratex.com/&gt;
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