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SPACE Parameter in JCL

 
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jdeeponline

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Joined: 08 Sep 2009
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Location: Charlotte

PostPosted: Wed Aug 04, 2010 10:26 am    Post subject: SPACE Parameter in JCL
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Hi,

We are processing considerably large files (upto 5GB). We have provide a space parameter of (CYL,(300,500),RLSE) along with VOL=(,,,25).

We have the secondary CYLs greater to prevent any Space ABEND dut to non avaiability of space for the allocation of Primary. is this ideal?

How will VOL parameter influence this choice?
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dbzTHEdinosauer

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Joined: 20 Oct 2006
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Location: porcelain throne

PostPosted: Wed Aug 04, 2010 10:33 am    Post subject:
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neither this thread nor this thread answered your question?

I realize that they were hard to find,
as they were from last week,
and in the proper forum.
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expat

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Joined: 14 Mar 2007
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Location: Back in jolly old England

PostPosted: Wed Aug 04, 2010 2:46 pm    Post subject: Re: SPACE Parameter in JCL
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jdeeponline wrote:
We have the secondary CYLs greater to prevent any Space ABEND dut to non avaiability of space for the allocation of Primary. is this ideal?

How will VOL parameter influence this choice?

Huh ??? If the primary allocation of 500 fails due to non availability then what chances do you expect to obtain an even higher amount for a secondary.

How will the VOL parameter influence the choice of what ?
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Pete Wilson

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Joined: 31 Dec 2009
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PostPosted: Mon Aug 16, 2010 10:10 pm    Post subject:
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Are you in a very space constrained environment? 5Gb isn't that big.

If you are space constrained, it's better to try and take lots of smaller extents unless your Dataclases (if applicable to your file) provide Space Constraint Relief which will split the allocation down to fit what's available to a point. Suggest talking to your Storge Admin people on that, and also ask if there is a Dataclas to provide Extended Format (EF) so you can have up to 123 extents per volumes and more than 65k tracks per volume, and this might also be a good candidate for Compaction.

Providing the VOL=(,,,25) means you can have up to 25 total volumes added if necessary with either 15 or 123 extents (EF) per volume. Volume count maximum is 59 for DASD datasets regardless of format.

You can also ask for space in numbers of records if you know that value.

e.g.
SPACE=(lrecl,(Pri,Sec),RLSE),AVGREC=K

SPACE=(80,(100,10),RLSE),AVGREC=K asks for space to cater for ~100,000 x 80 bytes records Primary and 10,000 Secondary for example.
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