ANSI SES-2: Overall element status usage clarification

Lisa TanVivian Lisa_TanVivian at
Tue Sep 18 01:48:24 PDT 2007

* From the T10 Reflector (t10 at, posted by:
* "Lisa TanVivian" <Lisa_TanVivian at>
The definition of the overall element status as stated in the current
ANSI SES-2 rev18 spec (page 65) is: 
"In an OVERALL STATUS field, the enclosure services process shall set
the ELEMENT STATUS CODE field to 0h if it does not implement overall
status detection, or it shall set the ELEMENT STATUS CODE field to:
a) if there are no ELEMENT STATUS fields, any value representing the
overall status;
b) if there are one or more ELEMENT STATUS fields and, in each of them,
the ELEMENT STATUS CODE field is set to 0h (i.e., Unsupported), any
value representing the overall status; and
c) if there are one or more ELEMENT STATUS fields and, in each of them,
the ELEMENT STATUS CODE field is not set to 0h (i.e., Unsupported), 0h
(i.e., Unsupported) or any value representing the overall status."
>From the statements above, it sounds as if the overall element status is
optional and could be set to any value regardless of the element status
fields. Please can you confirm this is the case? I also noticed that in
ANSI SES-2 rev18 spec (page viii) there are notes in the pending
proposal section about clarifying the usage of overall status/control
fields in the next SES revision. Please could you elaborate what changes
these are likely to be? 
Lisa Tan-Vivian
Software Engineer
Storage Systems
Xyratex Technology Ltd.
Langstone Technology Park.
Langstone Road
United Kingdom
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Email: Lisa_TanVivian at 
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