Tom Marchant wrote:
In order for any DASD subsystem to be insensitive to blocksize, it would
have to do something similar, compressing out the gaps and storing the track
in discontiguous locations.
AFAIK, the rest of modern DASD subsystems allocate specific locations for
each logical volume, and therefore for each logical track. There has to be
sufficient disk space to store the maximum amount of data in each track
location. If short blocks are written, less data will fit in that logical
track.
We "grew" a couple of our 3390s from just under 64K cylinders to 220K
cylinders with a single click on the DS8100's HMC. There was no need to
copy data from device X to device Y. Device X simply "grew" in place
while it was still on-line to z/OS. Either way, there must be some
serious virtualization going on to make that possible.
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
[email protected]
http://www.phoenixsoftware.com/
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