Clarification on SES-3 OTHER ELEMENT INDEX

Alan Westbury Alan_Westbury at
Fri Aug 12 07:29:36 PDT 2011

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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 Westbury
Product Architect
Storage Systems, 
Langstone Road, Havant, PO9 1SA
United Kingdom
Email: alan_westbury at <mailto:alan_westbury at> <BLOCKED::; 
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