Re: Bidirectional SCSI commands and iSCSI

[julian_satran@il.ibm.com]

Jim,

What is the intended use?  Are there already commands that use it?
Is there a major/minor distinction - like output data & input results or
output
parameters & input data - or is it intended to be completely symmetric?

Julo

"Jim Hafner/Almaden/IBM" <hafner@almaden.ibm.com> on 20/09/2000 17:56:27

Please respond to "Jim Hafner/Almaden/IBM" <hafner@almaden.ibm.com>

To:   ips@ece.cmu.edu
cc:    (bcc: Julian Satran/Haifa/IBM)
Subject:  Bidirectional SCSI commands and iSCSI




Folks,

In case you missed this, T10 just approved changes to SAM-2 (rev14) which
remove the restriction that a single SCSI command can have a data flow in
only one direction (DataIn xor DataOut).   Transport specs (that want to
allow this) will need to change to allow for two sets of Data buffer fields
in the headers (length, over/underrun, etc.).

Is anybody looking to modify the iSCSI spec to get these concepts
supported?

Jim Hafner