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[Vinodch]

The Job A consumes only 5 mins CPU time but the elasped time is around 5 hrs, the job seems to be waiting for some resources. The below mentioned are the tape messages from the JESLOG: Job has 4 tapes accessing as an i/p file referenced using the parameter UNIT=AFF

SMC0045 Conflicting exclusion criteria for job USERIDA step STEP02 DD SQIN1
SMC0046 USERPOLICY ESOTERIC would have excluded all devices; not honored
SMC0045 Conflicting exclusion criteria for job USERIDA step STEP02 DD SQIN1
SMC0046 POLRECTECH would have excluded all devices; not honored

Tapes are accessed like the below mentioned in the JCL:

//AI DD DSN=XXXX.XXXX(0),
// DISP=SHR,BUFNO=250
//*
//BI DD DSN=YYYY.YYYY(0),
// DISP=SHR,UNIT=AFF=AI,BUFNO=250
//*
//CI DD DSN=ZZZZ.ZZZZ(0),
// DISP=SHR,UNIT=AFF=AI,BUFNO=250
//*
//DI DD DSN=AAAA.AAAA(0),
// DISP=SHR,UNIT=AFF=AI,BUFNO=250
//*

Please advice what causing the elasped time more.
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Thanks,
Vinod.

[Nic Clouston]

That coding is more or less fine (DISP=OLD would have been better) if BI is accessed after all processing for AI has been done etc. It seems a bit strange that one file is not accessed until the previous file has been finished with - usually they would be read in parallel which you cannot do with UNIT=AFF. I'm not saying it is wrong, just unusual.

CPU time has no relation to elapsed time except it cannot be greater. Most of your elapsed time is probably taken up waiting for tapes to be mounted and data transferred.
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Utility and Program control cards are NOT, repeat NOT, JCL.

[expat]

I for one would reduce the BUFNO parameter, maybe just get rid of it altogether. Most modern tape subsystems are fast anyway.

For every BUFNO specified you need the BLKSIZE value in storage.

Maybe your job gets swapped out / paged out because you are demanding too much storage for the system to give you, and by placing a high demand become a highly desired SWAP OUT candidate.
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