Re: Data in SCSI Response or SCSI Data

[julian_satran@il.ibm.com]

It is assumed that short operations - let's say a 2-4k read will be handled
is one block including status enabling an initiator to get them in maximum
2 read operations.

Data and status will appear in the response.

Julo

"Ferrari, Stephen" <smf@pirus.com> on 24/08/2000 19:15:56

Please respond to "Ferrari, Stephen" <smf@pirus.com>

To:   "'ips@ece.cmu.edu'" <ips@ece.cmu.edu>
cc:    (bcc: Julian Satran/Haifa/IBM)
Subject:  Data in SCSI Response or SCSI Data




For successful SCSI commands where the target sends data to the host, there
appear to be several combinations of data and response that are allowed:

*    Data sent in a SCSI Data packet and status sent in a SCSI Response
packet
*    Data and status sent in a SCSI Data packet, using the (S) bit
*    Data and status sent in a SCSI Response packet

Is the target free to choose any of these, at its option, requiring the
initiator to handle all of them?  Is there a requirement that some commands
(say, READ) use the first or second method, and other commands (say,
INQUIRY) use the third?  Is the data in a successful SCSI Response packet
exactly equivalent to data in a SCSI Data packet, with an assumed offset of
zero?

I couldn't find the answer in the July 10th draft.  If someone could point
me at it, I'd appreciate it.

Thanks,

     Stephen Ferrari
     Pirus Networks