Will First Burst Enabled be Implemented

Evans, Mark Mark_Evans at maxtor.com
Tue Apr 12 13:28:22 PDT 2005


* From the T10 Reflector (t10 at t10.org), posted by:
* "Evans, Mark" <Mark_Evans at maxtor.com>
*
I would be most interested if there are any "yes" answers to Paul's
query, as I thought that Rob had already cajoled me into constructing a
proposal for SAS 2 to obsolete this feature.

Regards,

Mark Evans
Maxtor Corporation
500 McCarthy Boulevard
Milpitas, CA  95035
408-894-5310

-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of
Paul.A.Suhler at certance.com
Sent: Tuesday, April 12, 2005 10:42 AM
To: t10 at t10.org
Subject: SAS: Will First Burst Enabled be Implemented

* From the T10 Reflector (t10 at t10.org), posted by:
* Paul.A.Suhler at certance.com
*
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 10.2.6.1.5).

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...

thanks,

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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