REQUEST SENSE LONG bit (01-199r3)

Ralph Weber ralphoweber at
Tue Feb 5 08:57:20 PST 2002

* From the T10 Reflector (t10 at, posted by:
* Ralph Weber <ralphoweber at>
01-199r3 contains the following statement:

  "If LONG is set to one [in the REQUEST SENSE CDB],
  the long sense data format shall be returned."

This statement is not backwards compatible. If a
REQUEST SENSE CDB is sent to an SPC-2 device server
(to whom the LONG bit is reserved and need not be
tested), that device server will return the non-long
(current format) sense data, no if's and's or but's.

The above cite sentence is being "edited" to change
'shall' to 'should'.

The bottom line is that an application client that
is willing to accept long sense data is obligated
to check the response code in any sense data it
receives in order to verify the sense data format.



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