JCL - calculate total space allocated for file

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calculate total space allocated for file

If file is having space parm as SPACE=(CYL,(10,10)) i.e. 10 primary, 10 secondary. So how much cylinders totally it will take before dataset filled till end?

Total Answers and Comments: 3

Last Update: April 15, 2009 Asked by: avinash_geek

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Submitted by: balakrishnaraothota

the question should be given clearly is it vsam or non vsam data set if it is non vsam it is having it is having both 16 primary and secondary extents else it is having 123 primary and secondary extents

Above answer was rated as good by the following members:
dsmanikandan, ishabudhiraja, ramanach

July 18, 2008 07:31:31

balakrishnaraothota

Member Since: May 2008 Contribution: 7

RE: calculate total space allocated for file

the question should be given clearly is it vsam or non vsam data set if it is non vsam it is having it is having both 16 primary and secondary extents else it is having 123 primary and secondary extents

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August 17, 2008 04:02:39

arun442

Member Since: August 2008 Contribution: 3

RE: calculate total space allocated for file

In such case the primary space which is 10 in this case used until it is finished then secondary memory(10) is stated to use but secondary memory can be used 150 times hence 150+10 160 is total space available on the cylinder.

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April 15, 2009 16:57:27

dhs01

Member Since: April 2009 Contribution: 24

RE: calculate total space allocated for file

Almost correct VSAM and non-VSAM are important but equally important is whether the allocation is to SMS controlled dasd. Another factor to consider is that allocations can both get more and less than 10 cylinders. In some cases an extent will be combined with other extents depending on physically where the extents are. (ie you could get 6 allocations of 10 cylinders but it would be 1 extent...) Another factor is that you can use up to 3 extents to get either the primary or secondary quantity. (in this case you might only get 40 cylinders and be out of extents...). So the short answer is that you can't say without a lot more information.

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