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Need the complete explanation of the DEFER Parameter


IBM Mainframe Forums -> JCL & VSAM
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mmmuthukumar

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Joined: 05 Feb 2004
Posts: 1
Location: Chennai , India

PostPosted: Fri Feb 13, 2004 2:02 pm
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I need the complete explanation of the DEFER Parameter , In my view - the system waits for the user to mount the device (such as tape) in between the JCL process , but i have so many contradictions , please do explain

8) MMKumar
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anuradha

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Joined: 06 Jan 2004
Posts: 247
Location: Hyderabad

PostPosted: Fri Feb 13, 2004 9:18 pm
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hi MMKumar,

In general this defer parameter is used for tape datasets.the meaning itself says postpone.

if u code UNIT=(TAPE,,DEFER),This can prevent unnecessary mounting of tapes if the job should terminate before the tape dataset is opened.

DEFER may be used to delay a tape mount request until the data set is opened. This avoids a mount request if the data set is never opened. The device allocation occurs at the beginning of the job step, whether DEFER is used or not. This defer option of the unit parameter is helpful when a program does not open the tape or catridge dataset immediately.

hope this may help u little atleast.
others please add. icon_lol.gif

THANKS AND REGARDS
ANU
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