On Thursday, 01/17/2008 at 09:42 EST, Kris Buelens <[EMAIL PROTECTED]> wrote: > VM doesn't use VTOCs to describe disk contents; the CP directory tells which > cylinders are allocated as minidisks, and the CP allocation map tells CP which > cylinders to use for PAGE, SPOOL, etc.
After a CPFMTXA FORMAT, I used DITTO to look at the VTOC that *is* on the volume: --- Data Set Name --- sorted by NAME ----- Ext Begin-end Reltrk, 1...5...10...15...20...25...30...35...40.... seq Cyl-hd Cyl-hd numtrks *** VTOC EXTENT *** 0 0 0 0 0 0,1 *** FREE EXTENT *** 0 0 1 4 14 1,74 *** This volume is currently 1 percent full with 74 tracks available I had always thought that a "full" VTOC was written by DSF so that MVS would not attempt to allocate space on a CP-owned volume. It is a 5 cyl 3390. Alan Altmark z/VM Development IBM Endicott
