IIRC, ICKDSF CPVOLUME FORMAT is supposed to set the FMT5 DSCB in
the "VTOC" for a volume to indicate that there is no free space on the
volume. The FMT4 DSCB should contain the size of the volume. I'm not
sure what DITTO is looking at, but z/OS should be using the FMT5 DSCB.
What does a DDR TYPE of cylinder 0, track 0 show?
--
Dale R. Smith
"There is a theory which states that if ever anybody discovers exactly
what the Universe is for and why it is here, it will instantly disappear
and be replaced by something even more bizarre and inexplicable.
There is another theory which states that this has already happened."
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On Fri, 18 Jan 2008 09:35:10 +0200, Kris Buelens <[EMAIL PROTECTED]>
wrote:
>Same here (for a VM resident)
> DITTO/ESA for VM DVT - Display VTOC Line 1 of 2
>
> Unit 0130 VFRRES 3390 with 3339 cyls, 15 trks/cyl, 58786 bytes/trk
>
> --- Data Set Name --- Ext Begin-end Reltrk,
> 1...5...10...15...20...25...30. seq Cyl-hd Cyl-hd numtrks
> *** VTOC EXTENT *** 0 0 0 0 0 0,1
> *** FREE EXTENT *** 0 0 1 3338 14 1,50084
> *** This volume is currently 0 % full with 50084 tracks available
>Maybe MVS is looking at some other field to find out if there still is
>free space
>
>2008/1/18, Alan Altmark <[EMAIL PROTECTED]>:
>> 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 tel
ls
>> which
>> > cylinders are allocated as minidisks, and the CP allocation map tell
s
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 c
yl
>> 3390.
>>
>> Alan Altmark
>> z/VM Development
>> IBM Endicott
>>
>
>
>
>--
>Kris Buelens,
>IBM Belgium, VM customer support
