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himanshu7
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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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Joined: 14 Mar 2007
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Location: Welsh Wales
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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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| Are there any mannuals available on IBM site? |
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himanshu7
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Posts: 131
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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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| click on the download link at top of the page |
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himanshu7
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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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Joined: 14 Mar 2007
Posts: 8796
Location: Welsh Wales
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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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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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| 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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Posts: 131
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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......  |
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expat
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Location: Welsh Wales
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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  |
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enrico-sorichetti
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and those were the times when You were declared an expert
because You knew which manuals to order |
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expat
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Location: Welsh Wales
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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 |
Or throw |
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enrico-sorichetti
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