Date: July 25, 1990                            X3T9.2/90-111 Rev 1
 
 
    To:   X3 Secretariat/CBEMA
          Lynn Barra, Administrator, Stds. Processing
          311 First Street, N.W.
          Suite 500
          Washington, DC 20001-2178
 
    From: George Penokie
          IBM
          Highway 52 N.
          Rochester, Mn. 55901
          Phone: (507)253-5208  FAX: (507)253-1302
 
    Subject: Request for Interpretation of the SCSI-2 (X3.131-199x)
    document on the procedures to use when doing logging operations
 
 
    Problem:
 
    In the descriptions of the Log Sense command, Log Select command, and
    the Log Parameters there are areas which are confusing or are not
    well defined.
 
    For example:
 
    The Log Sense command (Section 7.2.7) does not give a clear picture of
    what is returned to the initiator for given bit patterns of PPC, PC,
    SP, DS, and LP (LP and DS are bits in the log parameter control byte).
 
    The Log Select command (Section 7.2.6) does not indicate how to setup
    the CDB when the initiator is sending list parameters to the target.
 
    In the Log Parameters (Section 7.3.2) the descriptions of the bits in
    byte 2 of the Log Parameters does not completely describe what to do
    when the logs become full.  There is also a reference to 'exception
    conditions' but is not made clear as to what 'exception conditions'
    are.  There is a cross-reference to 7.3.3.1 which implies that section
    will explain what 'exception conditions' are, but that section only
    references back to section 7.3.2.
 
    Also, it is not clear what the target should do given the various ways
    the 'exception conditions' can occur.  Nor is it clear what the target
    should do if the initiator ignores the 'exception condition'.