SBP-2 Bidirectional ORB

PJohansson at PJohansson at
Mon Oct 6 15:07:24 PDT 1997

* From the T10 (formerly SCSI) Reflector (t10 at, posted by:
* PJohansson at
In a message dated 97-10-06 17:55:15 EDT, jfuller at writes:

<<I think that there are way too many differences between this and the
unidirectional ORB.  They will make it impossible to write one SBP-2 driver
that can handle both unidirectional and bi-directional devices.>>

>From what I understand in conversation with you, John, is that SBP-2 is *so*
lightweight that no stand-alone SBP-2 driver is anticipated in your operating
systems---only very thin SBP-2 layers at the bottom edges of device class

The format I proposed is not the last word but a starting point. There was
some reason to the choices, for example, a larger data_length field to handle
unpaged transfers greater than 64 Kb. If you've got improvements to suggest
I'm open to them.

Peter Johansson

Congruent Software, Inc.
3998 Whittle Avenue
Oakland, CA  94602

(510) 531-5472
(510) 531-2942 FAX

pjohansson at

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