On 11/23/2022 12:31 PM, Pommier, Rex wrote:
Hi Tom, yes and no. :-)
No, it isn't true on the physical back end because all the disk is emulated on
top of FBA architectures and especially with thin provisioning, only actually
used tracks are really used. However, from a z/OS perspective yes the space is
still wasted because it is still allocated in cylinders and tracks, and from a
z/OS point of view if I have BLKSIZE=32760 RECFM=FB, z/OS can't do anything
with the remaining space.
I think even with thin provisioning, the backing is at the extent level
(usually 21 cylinders).
What happens or doesn't happen at the end of a track changes nothing...
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
https://www.phoenixsoftware.com/
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