Promptness, queueing, diskless etc. etc.

[Jonathan Shapiro]

   > 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.

I think you misread me - too many negatives.  I was saying that the
SCSI driver behaves as you stated - multitrack/multicyl ops are fine,
but other disk types do not do multicyl ops, and in many cases not
multitrack either.

   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.

Who said the bank was remote?  If you take a distributed single level
store to its logical conclusion, the bank will get faulted to the
accessing site or the call will be sent to the remote.  Basically, the
DSSS makes the remoteness invisible. It will depend on where, at any
given moment, it proves to be most advantageous to situate the bank.