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raman.k
New User
Joined: 26 Feb 2007
Posts: 24
Location: chennai
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Hi
In Space paramater what is the differation between Primary space and secondry space. |
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vasanthkumarhb
Active User
Joined: 06 Sep 2007
Posts: 275
Location: Bang,iflex
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Hi,
Space parameter constitiutes 2 parts
1, primary
2.secondary
you have to provide this while creating the datasets, primary space indicates the primary space for the dataset to be loaded by programs or by data's
If the primary space is finished then comes, secondary space in to the picture, which gives extension of memory space to the already filled primary space, it gives space 15 times the number specified in the secondary space place.
Refer below.
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SPACE=(TRKS(4,3)
OR
SPACE=(CYL(4,3) |
1 Cylinder is equal to 15 times the Tracks |
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revel
Active User
Joined: 05 Apr 2005
Posts: 135
Location: Bangalore/Chennai-INDIA
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Hi raguraman,
I acclaim what Vasanth said,
Consider a example
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| SPACE = (TRKS(4,3)) |
When you allocate a dataset with this attribute, initially 4 tracks will reserved for you(Data set), once the reserved space is complete then 3 tracks will reserved for u, it will goes up to 15 extent
Hope you clear |
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vasanthkumarhb
Active User
Joined: 06 Sep 2007
Posts: 275
Location: Bang,iflex
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Hi Raghu,
Thank you for more info regarding this, i missed one right braces inmy previous post. |
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gcicchet
Senior Member
Joined: 28 Jul 2006
Posts: 1702
Location: Australia
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Hi,
what has been mentioned is not strictly correct.
eg. SPACE=(TRK,(200,50))
Space allocation rules on DISK is as follows:-
Single volume allocation can have up to 16 extents but this does not mean that you will get Primary 200 trks in one extent and then 15 times Secondary allocation of 50 tracks which should be 950 tracks). The rules for extents are:-
Primary allocation can be in 5 extents and each of the secondary allocations can be in 5 extents too which means that in the worst case you would get::-
1 Primary allocation 200 tracks in 5 extents
2 Secondary allocation each in 5 extents = 100 tracks in 10 extents
Total 300 tracks in 15 extents
Gerry |
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raman.k
New User
Joined: 26 Feb 2007
Posts: 24
Location: chennai
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Thanks for all responser
Thanks you very much |
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