Promptness, queueing, diskless etc. etc.

[William S. Frantz]

> I think you mean IDE?

Yes


> The other commonly implemented driver is the SCSI driver, because SCSI
> does not present a compatible low-level I/O interface.  This driver
> generally will not do multiple operations for a multicylinder or
> multitrack read.

My memory of the interface says you have to stand on your head if you
want to find out what the geometry of the disk is.  It sounds like
someone went to a lot of work to make things less useful.


> The difficulty is that the dead domain might be, say, the prime space
> bank, if it happened that due to process migration the prime space
> bank was on the dead machine.  Equally, it might be a meter near the
> root of a critical tree.  At some point you have to get into
> discussions of redundancy.

I agree we need to talk about redundancy.  When we were discussing some
of these issues, we had the idea of replacing remote keys to things like
space banks and superior meters with keys to local equilivents.  We 
didn't go far enough down that path to come up with a way of specifing
a policy of what would be replaced and what would still refer to the
remote resource.

For a start, I would say that "precious" domains can not be migrated.
They can trust services provided by other "precious" domains, but better
be prepared to lose contact with "non-precious" domains.

-----------------------------------------------------------------
Bill Frantz                   Periwinkle  --  Computer Consulting
(408)356-8506                 16345 Englewood Ave.
frantz@netcom.com             Los Gatos, CA 95032, USA