In <[email protected]>, on 05/06/2015
   at 03:07 PM, John Eells <[email protected]> said:

>At allocation time, the system converts anything other than tracks 
>to tracks, basically.

No; the system records wehther allocation is in tracks or in cylinders
so that it can correctly allocate secondary extents. For SMS datasets
there are also data in the NVR. 
 
-- 
     Shmuel (Seymour J.) Metz, SysProg and JOAT
     ISO position; see <http://patriot.net/~shmuel/resume/brief.html> 
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)

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