SAS: Will First Burst Enabled be Implemented

Paul.A.Suhler at Paul.A.Suhler at
Tue Apr 12 10:42:29 PDT 2005

* From the T10 Reflector (t10 at, posted by:
* Paul.A.Suhler at
Would any HBA vendor care to state whether they are planning on setting the
Enable First Burst bit in the SSP Command information unit?  It looks like
a good way to reduce latency on data-out commands:

    Indicates that first burst data is being delivered based on the ENABLE
    FIRST BURST field in the COMMAND frame and the FIRST BURST SIZE
    field in the Disconnect-Reconnect mode page (see

I ask because, the same feature has been available in FCP (Write
FCP_XFER_RDY Disabled in PRLI service parameters also turns off the first
transfer ready), but it was never implemented and has been prohibited in
the profiles.  If no one is going to use it in SAS...


Paul Suhler
Firmware Engineer
Quantum Corporation
1650 Sunflower Avenue
Costa Mesa, California  92626
(714) 641-2485 (voice)
(714) 966-7328 (fax)

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