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What is AFF=ddname (this comes in the UNIT parameter)

 
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murali922

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Joined: 25 Jul 2005
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Location: India

PostPosted: Wed Oct 26, 2005 10:12 am    Post subject: What is AFF=ddname (this comes in the UNIT parameter)
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Hi,

Could anyone let me know what is the use of coding this in a JCL :

AFF=ddname (this comes in the UNIT parameter)..
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ksreddy1976

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Joined: 28 Jun 2005
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PostPosted: Wed Oct 26, 2005 10:32 am    Post subject:
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UNIT=AFF when Requesting Extended Data Sets in a JES3 System

In a multiple-step job in a JES3 system, if a data set is extended in an early job step to additional volumes, MVS allocates the additional devices needed. JES3 is unaware of the additional devices. If a later step requests the data set, code UNIT=AFF=ddname so that the system allocates the original and additional devices for the data set.
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murali922

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PostPosted: Wed Oct 26, 2005 10:41 am    Post subject: Re: AFF=ddname ???!!!
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Does this mean that :

step 1 : I have a dataset with name as DS1, with space=(cyl,(1,5)). And I do some processing to make this dataset full.

step 2 : I am trying to use the dataset. And this time I would code UNIT = AFF = DS1 or <the name of the new dataset>

If I use AFF= it would use the same volume used by DS1 or it would create the same amount of space but in a different memory location ??
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