question about consecutive data group transfers

Mcgrath, Jim Jim_Mcgrath at maxtor.com
Tue Sep 4 14:01:56 PDT 2001


* From the T10 Reflector (t10 at t10.org), posted by:
* "Mcgrath, Jim" <Jim_Mcgrath at maxtor.com>
*

George is correct - my memory was a bit off since you actually cannot do the
end of group 2 (i.e. the CRC for that group) before finishing group 1, let
alone start group 3.

Jim


-----Original Message-----
From: George Penokie [mailto:gop at us.ibm.com]
Sent: Tuesday, September 04, 2001 1:50 PM
To: Armen Avakian
Cc: t10 at t10.org
Subject: Re: question about consecutive data group transfers


* From the T10 Reflector (t10 at t10.org), posted by:
* "George Penokie" <gop at us.ibm.com>
*

Armen,
Yes the target is allowed to issue REQs up to the negotiated sync offset
any time. The only time the target cannot issue REQs is if it has not
received ACKs for CRC data and it wants to send more CRC data. The rule is
there can only be one CRC in the offset buffer at a time.

Bye for now,
George Penokie

Dept 2C6  114-2 N212
E-Mail:    gop at us.ibm.com
Internal:  553-5208
External: 507-253-5208   FAX: 507-253-2880



Armen Avakian <aavakian at emc.com>@t10.org on 09/04/2001 03:30:33 PM

Sent by:  owner-t10 at t10.org


To:   t10 at t10.org
cc:
Subject:  question about consecutive data group transfers



* From the T10 Reflector (t10 at t10.org), posted by:
* Armen Avakian <aavakian at emc.com>
*

Hi,

In 160/m, when the target is tranmitting or receiving consecutive data
groups (DT_REQ = 1, IU_REQ = 0),
will the target issue REQ's up to the negotiated sync offset for the
current
data group, even though the initiator has not ACKed all the REQ's prior to
CRC
REQ for the previous data group? Or will it only issue REQ's up to the
difference
between negotiated offset and outstanding ACK's from previous data group?

Thanks in advance,

aa
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