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Space required for 100 records of 80 length FB

 
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himanshu7

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PostPosted: Fri Apr 03, 2009 3:48 pm    Post subject: Space required for 100 records of 80 length FB
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Hi All,

Can you please share some mannuals for 3390 DASD Specification.

I need information about the allocation on primary and secondary.

Im looking out for the space allocation for VSAM type Dataset.

How much space a VSAM ksds would be occupying for 3390 type DASD to accomodate 100 records of 80 length.
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expat

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PostPosted: Fri Apr 03, 2009 4:17 pm    Post subject:
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The amount of space allocated would depend entirely on the VSAM specification. TRK(1 1) would suffice for this, but if you used CYL(1 1) then you would use a whole cylinder + index space.

Of course if you were experimental and tried to load the records with a definition of CYL(1 1) FSPC(100 100) you might see some surprising results.

Take a look at the IBM redbooks and look for VSAM demystified for the best explanation in town.
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himanshu7

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PostPosted: Fri Apr 03, 2009 4:17 pm    Post subject:
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Are there any mannuals available on IBM site?
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himanshu7

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PostPosted: Fri Apr 03, 2009 4:24 pm    Post subject:
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Hi Expat,

Thanks for the reply.

Quote:
definition of CYL(1 1) FSPC(100 100) you might see some surprising results



I'm aware of the surprising result using FSPC(100,100).

Quote:
VSAM demystified for the best explanation in town



Have looked into this however could you please share the links for IBM aredbook for allocation if possible?

I'm experimenting and wondering what would be the best suitable size of the KSDS DSN if the LRECL is 80 and there are 100 records.Can we be able to calculate the size required if the Length and num of records are known?
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enrico-sorichetti

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PostPosted: Fri Apr 03, 2009 4:25 pm    Post subject: Reply to: Space required for 100 records of 80 length FB
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click on the download link at top of the page
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himanshu7

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PostPosted: Fri Apr 03, 2009 4:26 pm    Post subject:
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Quote:
TRK(1 1) would suffice for this



How did you come to the above conclusion?
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expat

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PostPosted: Fri Apr 03, 2009 4:31 pm    Post subject:
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himanshu7 wrote:
Quote:
TRK(1 1) would suffice for this

How did you come to the above conclusion?

30+ years of experience and learning.

Quote:
Have looked into this however could you please share the links for IBM aredbook for allocation if possible?

If you can not find the IBM website and redbook area on your own .........................
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enrico-sorichetti

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PostPosted: Fri Apr 03, 2009 4:33 pm    Post subject: Reply to: Space required for 100 records of 80 length FB
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quick and dirty
record format fixed lrecl 80

cidf 4 bytes two rdf 3 + 3 bytes ==> 10 bytes of control info

esds, cisz 4096, 51 records per ci , 12 ci per track

1 track will hold 612 records
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enrico-sorichetti

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PostPosted: Fri Apr 03, 2009 4:34 pm    Post subject: Reply to: Space required for 100 records of 80 length FB
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Quote:
30+ years of experience and learning.


and reading the manuals,
once upon a time there were no forums
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himanshu7

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PostPosted: Fri Apr 03, 2009 6:11 pm    Post subject:
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Thanks enrico and expat.
Quote:
once upon a time there were no forums

Thats really true..

Am also Thankful for such a wonderfull forum and to have you guys with us to show us the Mainframe way...... icon_lol.gif
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expat

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PostPosted: Sat Apr 04, 2009 2:51 pm    Post subject: Re: Reply to: Space required for 100 records of 80 length FB
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enrico-sorichetti wrote:
Quote:
30+ years of experience and learning.

and reading the manuals,
once upon a time there were no forums

Aaaaaaaaah, those were the days. Ask a dumb question and not only was the phrase " RTFM" hurled at you, but swiftly followed by the manual at high velocity and deadly accuracy icon_biggrin.gif
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enrico-sorichetti

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PostPosted: Sat Apr 04, 2009 3:01 pm    Post subject: Reply to: Space required for 100 records of 80 length FB
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and those were the times when You were declared an expert
because You knew which manuals to order icon_biggrin.gif
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expat

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PostPosted: Sat Apr 04, 2009 3:06 pm    Post subject: Re: Reply to: Space required for 100 records of 80 length FB
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enrico-sorichetti wrote:
and those were the times when You were declared an expert
because You knew which manuals to order icon_biggrin.gif

Or throw icon_biggrin.gif
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enrico-sorichetti

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PostPosted: Sat Apr 04, 2009 3:30 pm    Post subject: Reply to: Space required for 100 records of 80 length FB
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here is a blocks per track calculator for 3390

http://www.ibmmainframes.com/viewtopic.php?t=35906&postdays=0&postorder=asc&start=0

and links to 3390 manuals
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