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mf_user
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 Posted: Wed Feb 08, 2006 6:35 am Post subject: calculating the space for a PS file. |
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Hi,
I need to provide SPACE parameters for an output file with following characteristics.
LRECL = 150
RECFM = FB
No. of Output records = 45000
I want to know how to allocate primary and secondary space for this requirement.
Would you please tell me in Tracks and Cylinders also.
Thanks for your time.
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MF
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kolusu
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mf_user
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| Posted: Thu Feb 09, 2006 12:37 am Post subject: |
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Thanks Kolusu.
That was very helpful.
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mf_user
Intermediate
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| Posted: Thu Feb 09, 2006 4:46 am Post subject: |
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And, I have used a tool in the mainframe itself and got the following SPACE details for this requirement.
| Code: |
3390 BLOCKSIZE SUMMARY; LRECL=150 KEY LENGTH=0
BLOCKSIZE BLOCKS/TRACK LRECLS/TRACK UTILIZATION
--------- ------------ ------------ -----------
150 72 72 19.1%
2,850 16 304 80.5%
3,150 15 315 83.4%
3,300 14 308 81.5%
3,750 13 325 86.0%
4,050 12 324 85.8%
4,500 11 330 87.4%
4,950 10 330 87.4%
5,700 9 342 90.5%
6,450 8 344 91.1%
7,500 7 350 92.7%
8,850 6 354 93.7%
10,650 5 355 94.0%
13,650 4 364 96.4%
18,450 3 369 97.7%
RECOMMENDED-->27,900 2 372 98.5%
32,700 1 218 57.7%
FOR BLKSIZE 27,900 AND 45,000 RECORDS, ALLOCATE:
242 BLOCKS, 121 TRACKS, OR 9 CYLINDERS ***
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The problem is it did not give the secondary space allocation at all. 
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mf_user
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| Posted: Thu Feb 09, 2006 4:47 am Post subject: |
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I used "TSO BLK3390 RECORDS". I don't know whether it was REXX or CLIST. 
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kolusu
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| Posted: Thu Feb 09, 2006 8:11 am Post subject: |
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| Quote: |
used "TSO BLK3390 RECORDS". I don't know whether it was REXX or CLIST.
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It must be your shop own clist/rexx and that TSO command is not a standard TSO command. The secondary allocation comes into picture for future growth of the dataset.
Kolusu
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mf_user
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MikeBaker
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| Posted: Fri Feb 10, 2006 2:59 am Post subject: |
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mf_user,
Don't invest too much faith in your BLK3390. It gives 27900 as the recommended blocksize. For a 3390, the (IBM) optimal blocksize is actually 27998.
And besides, any decent shop should be using System Determined Blocksize. Hard-coding blocksizes on QSAM output files is a caveman technique. It should be blocksize = 0, which will automatically invoke SMS SDB. |
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mf_user
Intermediate
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Posts: 372
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| Posted: Fri Feb 10, 2006 3:33 am Post subject: |
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MikeBaker,
Thank you. I did not know this fact.
_________________
MF
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