A VM volume can be formatted two ways:
* if initialized using the CPFMTXA (which actually invokes ICKDSF "INIT
CPFORMAT") it contains a dummy MVS VTOC on cylinder 0, track 0 starting
on record 5. This is not a natural location for a VTOC, but it does
allow the volume to be mounted on MVS. This VTOC never has datasets in
it and shows no free space on the volume. Products like FDR and
DFSMSdss recognize this dummy VTOC and know that it is VM-formatted
* but you can also initialize the volume with standard ICKDSF INIT,
which puts a real VTOC on the volume. Since by default it puts a small
VTOC on cyl 0, track 1, and VM mini-disks are generally allocated
starting on cylinder 1, this will work for VM, but MVS will see it is an
empty volume.
So you must have case 2. The only way to copy these under MVS is to use
the COPY TRACKS function of DFSMSdss, specifying the whole size of the
volume.
It is possible to reformat the VTOC without disturbing the data, but I
don't know VM well enough to tell you how
--
Bruce Black
Senior Software Developer
Innovation Data Processing
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