Re: iSCSI: Use of the A bit

["Julian Satran" <Julian_Satran@il.ibm.com>]

Dear all,

The text for the A bit part (9.7.2) reads now:

   A (Acknowledge) bit


       For sessions with ErrorRecoveryLevel 1 or higher, the target sets
       this bit to 1 to indicate that it requests a positive
       acknowledgement from the initiator for the data received.  The
       target should use the A bit moderately; it MAY set the A bit to 1
       only once every MaxBurstSize bytes or on the last Data-In PDU that
       concludes the entire requested read data transfer for the task from
       the target's perspective, and MUST NOT do so more frequently than
       this.

       On receiving a Data-In PDU with the A bit set to 1, the initiator
       MUST issue a SNACK of type DataACK.  If the initiator has detected
       holes in the input sequence, it MUST postpone issuing the SNACK of
       type DataACK until the holes are filled. An initiator MUST ONLY
       acknowledge the status for command that produced Data-In PDUs after
       acknowledging the Data-In PDUs if Data-In PDU acknowledgment is
       requested by the target. A status acknowledgement for a command that
       generated Data-In PDUs is considered by the target as an implicit
       acknowledgement of the Data-In PDUs if such an acknowledgement was
       requested by the target.

The ITT mandating text in 9,16.1 will read:

       For Status SNACK and DataACK, the Initiator Task Tag is reserved. In
       all other cases, the Initiator Task Tag field MUST be set to the
       Ini-tiator Task Tag of the referenced command.


       Julo