RE>Comments on SCAM
jmcgrath at qntm.com
jmcgrath at qntm.com
Tue May 3 15:48:01 PDT 1994
Reply to: RE>Comments on SCAM
I had only one disagrement with Jeff, outlined below:
4) Should the soft ID be saved to the saved ID to become the current ID
following the a subsequent reset condition or power-on condition?
Larry - The answer seems to be no - the soft ID is never remembered by a
device following a reset condition or a power-on condition.
jpm - I agree
Jeff E. - I disagree. We need a "warm boot" capability. The trouble is
that we never agreed to solve this problem -- and I think it's important
that we solve it. For example, if power has not been removed from the bus
(ie from the level 1 host and peripherals), then an ordinary "reset" that is
not followed up with a SCAM isolation sequence (by the host) should leave
all devices IDs as they were. This would be a "warm boot" However, if
the host starts the SCAM sequence, this would be a "cold boot".
This does not seem like a hard thing to do. Comments?
jpm - the problem is that we are in the process of shipping SCAM devices
implemented as in the specification - we forget the ID on reset, and revert
to the default ID. Changing that right now is impossible for us. I suggest
any change be considered a SCAM level 3 action item (what, you thought
things would end at level 2?). Specifically as part of the next question
concerning
a mode page for SCSI ID. Note that this still means the host adaptor people
have
to work with what is currently documented (i.e. no soft ID) - but as I said,
I think that ship has sailed.
More information about the T10
mailing list