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stacking files on a tape


IBM Mainframe Forums -> JCL & VSAM
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Pedro

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PostPosted: Wed Aug 17, 2016 11:11 pm
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I am not a user of tapes.

Someone asked me about how to 'stack files' on a tape, from my tool. I probably need to change the JCL that is created. I hope someone can correct me if I am wrong.

Is it a matter of simply using a series of DD statements like this?
Code:
//OUT1  DD DISP=(,CATLG),DSN=USERID.TEST.WORK1,LABEL=(1,SL), 
//   UNIT=3480,VOL=SER=FORUM                                 
//OUT2  DD DISP=(,CATLG),DSN=USERID.TEST.WORK2,LABEL=(2,SL), 
//   UNIT=3480,VOL=SER=FORUM 
//OUT3  DD DISP=(,CATLG),DSN=USERID.TEST.WORK3,LABEL=(3,SL), 
//   UNIT=3480,VOL=SER=FORUM 
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Robert Sample

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PostPosted: Wed Aug 17, 2016 11:42 pm
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That's pretty much it. I've seen referback used a number of times to ensure the same tape is used for each data set, especially when writing to a scratch tape where the volume serial isn't known until execution time.
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Bill Woodger

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PostPosted: Thu Aug 18, 2016 1:03 am
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I've done it like that from multiple steps.

I've recently seen comment that it is a bit of an "old" way to do things, so what is the particular purpose of the stacking?
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Pedro

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PostPosted: Thu Aug 18, 2016 5:15 am
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Someone gave me this example, as what I probably have to change to:
Code:
Step 1:
//OUTDD1    DD DSN=dsnA, 
//             UNIT=TAPE,LABEL=(1,SL),       
//             DISP=(NEW,CATLG),         
//             VOL=(,RETAIN,,99)

Step 2:                 
//OUTDD2    DD DSN=dsnB,   
//             UNIT=AFF=OUTDD1,LABEL=(2,SL),     
//             DISP=(NEW,CATLG),         
//             VOL=(,RETAIN,,99,REF=*.OUTDD1) 
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Pedro

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PostPosted: Thu Aug 18, 2016 5:22 am
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Quote:
so what is the particular purpose of the stacking?


It is probably not a big deal for a few data sets, but if they have a few hundred data sets, the time to mount the tape and position to where it needs to be might add up. I do not have a good concept of the time... my guess is maybe the job running 20 minutes longer (elapsed time).

Likewise, if it is set of related data sets, eventually you may want to copy back from the tape and if they are all together, it would really simplify the task.
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enrico-sorichetti

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PostPosted: Thu Aug 18, 2016 5:13 pm
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why not evaluate the use of ADRDSSU ?
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Pedro

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PostPosted: Thu Aug 18, 2016 9:19 pm
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Quote:
why not evaluate the use of ADRDSSU ?

These are DB2 objects... best handled by DB2 utilities.
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Terry Heinze

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Joined: 14 Jul 2008
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Location: Richfield, MN, USA

PostPosted: Thu Aug 18, 2016 11:15 pm
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Quote:
Likewise, if it is set of related data sets, eventually you may want to copy back from the tape and if they are all together, it would really simplify the task.

Some shops run batch jobs to redistribute tape data sets to free up unused tape, and as a result, your data sets may end up on different volumes anyway. You might want to check with the tape storage folks to see what they do.
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