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    iSCSI - Response/Status



    According to the discusions on the list 2.4.2 & 2.4.3 have been fixed to
    read:
    
    1.1.1     Status
    
       The Status field is used to report the SCSI status of the command (as
       specified in [SAM2]) and is valid only if the Response Code is Command
       Completed at target.
    
       If a SCSI device error is detected while data from the initiator is
       still expected (the command PDU did not contain all the data and the
       target has not received a Data PDU with the final bit Set) the target
       MUST wait until it receives the a Data PDU with the F bit set, in the
       last expected sequence, before sending the Response PDU.
    
    1.1.2     Response
    
       This field contains iSCSI service response.
    
       Valid iSCSI service response codes are:
    
          0x00 - Command Completed at Target
          0x01 - Target Failure
          0x02 - Delivery Subsystem Failure
          0x80-0xff - Reserved for Vendor-Unique Responses
    
       The Response is used to report a Service Response. The exact mapping of
       the iSCSI response codes to SAM service response symbols is outside the
       scope of this document.
    
       Certain iSCSI conditions result in the command being terminated at the
       target (response Command Completed at Target) with a SCSI Check
       Condition Status as outlined in the next table:
    
       +------------------------------+---------------------------+
       | Reason                       | with SCSI CHECK CONDITION |
       +------------------------------+---------------------------+
       | Unsolicited data rejected    | ASC = 0x49 ASCQ = 0x00    |
       +------------------------------+---------------------------+
       | Not enough unsolicited       | ASC = 0x4B ASCQ = 0x00    |
       +------------------------------+---------------------------+
       | SNACK rejected               | ASC = 0x47 ASCQ = 0x03    |
       +------------------------------+---------------------------+
    
       N.B. Unsolicited data rejected condition is reported used by the target
       only if it does not support output (write) operations in which the total
       data length is higher than FirstBurstSize but the initiator sent less
       than first burst size and out-of-order R2Ts can't be used.
    
       Julo
    
    


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Last updated: Tue Sep 04 01:04:04 2001
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