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Formula for calculating the number of tracks and cylinders

 
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rksenthil2003

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Joined: 01 Jun 2007
Posts: 7
Location: Chennai

PostPosted: Mon Jul 02, 2007 6:05 pm    Post subject: Formula for calculating the number of tracks and cylinders
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Hi

I have to allocate space for a file which contains 550 million records, each of LRECL = 130.

Is there any formula for calculating the number of tracks and cylinders required?

Regards
Senthil.
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murmohk1

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Joined: 29 Jun 2006
Posts: 1439
Location: Bangalore,India

PostPosted: Mon Jul 02, 2007 6:10 pm    Post subject:
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Senthil,

Quote:
allocate space for a file which contains 550 million records, each of LRECL = 130


You really wanted to use DASD for this.
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rksenthil2003

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Location: Chennai

PostPosted: Mon Jul 02, 2007 6:17 pm    Post subject: Re: SPACE in JCL
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Murmokh1,

Is there any SPACE calculation procedure in general?
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murmohk1

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PostPosted: Mon Jul 02, 2007 6:29 pm    Post subject:
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Senthil,

Quote:
Is there any SPACE calculation procedure in general?


Use SPACE and AVGREC parameters in conjuntion. This actually relives you from manual space calculation.

Hint: Go through AVGREC syntax in QW.
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dick scherrer

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PostPosted: Mon Jul 02, 2007 8:35 pm    Post subject:
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Hello,

Yes, you can calculate the space required with some arithmetic.

If you want an estimate of the space needed, take a look at
http://ibmmainframes.com/viewtopic.php?t=21546
and
http://ibmmainframes.com/viewtopic.php?t=12634
to see if they help.

If there are still questions, please let us know.
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expat

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Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Mon Jul 02, 2007 10:37 pm    Post subject: Re: Formula for calculating the number of tracks and cylinde
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Mmmmmmmmmmmmmmmmm, assuming that the file is FB and you use optimum blocking for 3390, you will need in excess of 85,000 cylinders.

As was mentioned before, are you sure that you want to use DASD ???

That's just under 10 3390 model 9's
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dick scherrer

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Location: Inside the Matrix

PostPosted: Tue Jul 03, 2007 1:02 am    Post subject:
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Hope we don't have to sort it. . . . icon_smile.gif
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