Vernooy, C.P. - SPLXM wrote:
"Chase, John" <[EMAIL PROTECTED]> wrote in message
news:<[EMAIL PROTECTED]
m>...
-----Original Message-----
From: IBM Mainframe Discussion List On Behalf Of McKown, John
Only z/OS is stuck on ECKD formatted DASD. z/VM and z/VSE can
both run on FBA. z/LINUX can run on FBA and/or on SAN/SCSI
DASD. I think that the latest z/VM can also run on SAN/SCSI
connected DASD as well. z/OS remains the hold out. For
whatever reason that may be.
Weaning z/OS from (E)CKD would likely be such a monumental change as
to
require that it be done at a version boundary and provide perhaps an
entire version life-cycle to complete.
"Who knows" how much non-IBM code would have to be revisited during
the
transition? More than a few CBT utilities would be relegated to the
dustbin of history.
It's probably also true that the longer such a transition is delayed,
the less likely it is to be attempted.
-jc-
What I miss in previous arguments is what is wrong with ECKD.
Let me try:
- space waste when writing short blocks
- space waste when writing short files
- limited volume capacity
- limited record size and block size
- incompatibility between unlike devices
Why should a large bunch of
software be rewriten? By the time the conversion has finished, FBA will
probably be replaced by something different.
That's what I asked about. However I'm not sure about answer. IMHO it
could be reasonable to rewrite the software to use "something different".
Remember: the break-pedal in your car still emulate the pedal on the
post coaches that pushed a chunk of wood against the outside of the
wheel. The real breaking infrastructure is hidden under the hood
(literally in this case). Who wants to the pedal to be rewritten to
control hydrolic breaksystems, with ABS control etc.?
Bad example. The break still operates in the same way. It was only
enhanced. It's like very old DASD and new shining 1TB WD Caviar.
However flash memory works in completely different manner, although it
can emulate rotating platters. Maybe elimination of this emulation would
give some advantages, maybe those advantages are worth of rewriting the
code (which can be evolutionary and long-term).
Just questions.
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