REQUEST SENSE in Stopped state

Elliott, Robert (Server Storage) elliott at hp.com
Fri Jan 21 12:25:46 PST 2005


* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <elliott at hp.com>
*
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This question arose during SPC-3 letter ballot resolution concerning =
the
REQUEST SENSE command:=20

While a direct-access block device (compliant with SBC-2) is in the
Stopped power condition state, does a REQUEST SENSE command return
parameter data containing an additional sense code of LOGICAL UNIT NOT
READY, INITIALIZING COMMAND REQUIRED?  While in either the idle and
standby power condition states, it returns an additional sense code =
like
LOW POWER CONDITION ACTIVE.

SBC-2 includes this rule in 4.15.2.6.1:=20
"While in this state:=20
a) the device server is not capable of processing medium access
commands. Any medium access=20
commands received while in this state shall cause the device server to
terminate the command with=20
CHECK CONDITION status with the sense key set to NOT READY and the
additional sense code set=20
to LOGICAL UNIT NOT READY, INITIALIZING COMMAND REQUIRED;"=20

However, REQUEST SENSE is not necessarily considered a "medium access
command" so it's not clear whether it would also return that
information.

Options are:=20
a) shall return it=20
b) should return it=20
c) may return it=20
d) shall not return it=20

2. SPC-3 also lists this additional sense code as a possible response =
to
the TEST UNIT READY command.  Are there any other non "medium access
commands" that return CHECK CONDITION/NOT READY/LOGICAL UNIT NOT READY,
INITIALIZING COMMAND REQUIRED?

---=20
Rob Elliott, HP Server Storage=20
elliott at hp.com=20


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 REQUEST SENSE in Stopped state This question arose during SPC-3 = letter ballot resolution concerning the REQUEST SENSE command: While a direct-access block device = (compliant with SBC-2) is in the Stopped power condition state, does a = REQUEST SENSE command return parameter data containing an additional = sense code of LOGICAL UNIT NOT READY, INITIALIZING COMMAND = REQUIRED?  While in either the idle and standby power condition = states, it returns an additional sense code like LOW POWER CONDITION = ACTIVE. SBC-2 includes this rule in = 4.15.2.6.1: 
;While in this state: 
a) the device server is not capable = of processing medium access commands. Any medium access 
commands received while in this state = shall cause the device server to terminate the command with 
CHECK CONDITION status with the sense = key set to NOT READY and the additional sense code set 
to LOGICAL UNIT NOT READY, = INITIALIZING COMMAND REQUIRED;; However, REQUEST SENSE is not = necessarily considered a ;medium access command; so it's not = clear whether it would also return that information. Options are: 
a) shall return it 
b) should return it 
c) may return it 
d) shall not return it 2. SPC-3 also lists this additional = sense code as a possible response to the TEST UNIT READY command.  = Are there any other non ;medium access commands; that return = CHECK CONDITION/NOT READY/LOGICAL UNIT NOT READY, INITIALIZING COMMAND = REQUIRED? --- 
Rob Elliott, HP Server Storage 
elliott at hp.com 
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