Years ago there was a Program Logic Manual (PLM) for SVS OPEN/CLOSE/EOV.  If 
you can find one of those it will give you a good idea of how it works today.  
Details may change, but I don't think the basic flow has.  In the last set of 
microfiche they provided, the IBM code had not changed much from MVT.  There 
were still comments in it about changes made for MVT.

Bottom line - IBM wants all that to be a 'black box' to the outside world and 
for you not to mess with.


Christopher Y. Blaicher
Senior Software Developer
Austin Development Lab

phone: 512.340.6154
mobile: 512.627.3803
fax: 512.340.6647

10431 Morado Circle 
Austin, TX 78759



-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of 
MONTERO ROMERO, ENRIQUE ELOI
Sent: Thursday, August 25, 2011 5:26 AM
To: [email protected]
Subject: tape alloc workflow or diagram

Hi,

I am looking for a diagram or workflow which explains how tape allocationas are 
performed.

i mean, when the job/program asks for a tape unit, which components have to 
work to give the tape to the program (RMM, Operative System, HSM, Catalog,...).

Is there some IBM manual that explains it?

Best regards,

Enrique Montero

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