Questions on SES specification -> Secondary subenclosures

Elliott, Robert (Server Storage) Elliott at
Thu Dec 22 17:10:22 PST 2011

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Enclosure-to-enclosure communication is vendor-specific; I2C or other
low-speed busses are candidates. They have to coordinate their IDs somehow.
The secondary subenclosure concept is mainly for architectures that don't
provide direct access to the secondary subenclosure; if there is direct
access, then it's a primary subenclosure and need not be secondary to
another.  A dual-domain architecture is possible where two subenclosures are
viewed as primary and secondary from one enclosure services process and
secondary and primary from the other; the ENCLOSURE LOGICAL ID will indicate
if that is the situation.
From: owner-t10 at [mailto:owner-t10 at] On Behalf Of Raj Divecha
Sent: Tuesday, 20 December, 2011 7:13 PM
To: t10 at
Subject: Questions on SES specification -> Secondary subenclosures
I believe a secondary subenclosure can refer to...
1)	An enclosure that is physically inside a primary enclosure. and
2)	An enclosure that is physically outside a primary enclosure.
It is the primary enclosure that would assign the subenclosure identifier to
various secondary subenclosures. Is the primary enclosure required to
communicate this subenclosure id to a secondary subenclosure? If yes, what is
the recommended mechanism?
Can a secondary subenclosure also have a SES LU visible to the application
client? I assume yes, as the information can be requested using Receive
Diagnostic Results command.
If yes, and if the application client requests enclosure information directly
|from the subenclosure, then should it report subenclosure id as 0 or
non-zero? I assume it should be 0 as it is the primary enclosure for the
information it is reporting.
And, when the primary enclosure is consolidating the enclosure information
|from more than one secondary subenclosure, it will update the subenclosure id
field(s) based on where the information came from. Is this understanding

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