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deepeshk79
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Joined: 20 Jun 2003
Posts: 112
Topics: 48
Location: Bangalore
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 Posted: Mon Sep 20, 2004 8:20 am Post subject: Current Allocation and Current Utilization |
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Hi All,
The space parameter for a particular file in our system here is as below
| Code: |
General Data Current Allocation
Management class . . : PRDGDG1 Allocated cylinders : 4,007
Storage class . . . : PRD1000S Allocated extents . : 55
Volume serial . . . : 1SSLKO +
Device type . . . . : 3390
Data class . . . . . : ADDDSORG Current Utilization
Organization . . . : PS Used cylinders . . : 4,007
Record format . . . : FB Used extents . . . : 55
Record length . . . : 650
Block size . . . . : 27950
1st extent cylinders: 250
Secondary cylinders : 100
Data set name type : SMS Compressible . : NO
Creation date . . . : 2004/09/17 Referenced date . . : 2004/09/20
Expiration date . . : ***None***
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The primary space is 250 cyls
The secondary space is 100 cyls
Hence the total space allocated should be 250+15*100 = 1750 cyls
But if we see the current utilization we get
| Code: |
Current Allocation
Allocated cylinders : 4,007
Allocated extents . : 55
Current Utilization
Used cylinders . . : 4,007
Used extents . . . : 55
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Howz that possible????
Thanks,
Deepesh |
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kolusu
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Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
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| Posted: Mon Sep 20, 2004 8:29 am Post subject: |
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Deepesh,
I am guessing that the dataset in question is allocated as EXTENDED FORMAT DATASET. Sequential data sets that are not in extended format are limited in size to 65535 tracks per volume. Extended-format data sets can use all allocatable space or up to 123 extents per volume. With compression, an extended-format data set can hold even more data.
Check this link for a detailed explanation of EXTENDED FORMAT DATASETS.
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/DGT2DI10/4.1.3?DT=20020122171102
Hope this helps...
Cheers
Kolusu
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deepeshk79
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Joined: 20 Jun 2003
Posts: 112
Topics: 48
Location: Bangalore
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| Posted: Mon Sep 20, 2004 8:45 am Post subject: |
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Hi Kolusu,
Thanks for the prompt reply.
1) But is there any way i can find out if the dataset is allocated as EXTENDED FORMAT DATASET ??
2) My dataset space should be increased now in such a way that it can hold 18000 records more. I did the following calculation for this
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LRECL = 650
Number of records to be added = 18000
Total bytes required = 18000 * 650 = 11700000 bytes
One cylinder = 838500 bytes
One track = 55900 bytes
Hence Total number of cylinders required = 11700000 / 838500 = 14 cylinders ( this includes both primary and secondary)
So the space parameter (CYL,(1,1),RLSE)=1+1*15=16 cyls will also suffice if we consider a file of just 18000 records separately. So there is no need to add any more space if the file already has (cyl,(250,100),rlse) allocated.
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If the file that i mentioned above is EXTENDED FORMAT DATASET, then i think we dont need to increase space at all. Isnt it??
Thanks,
Deepesh |
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kolusu
Site Admin
Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
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| Posted: Mon Sep 20, 2004 9:05 am Post subject: |
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Deepesh,
| Quote: |
1) But is there any way i can find out if the dataset is allocated as EXTENDED FORMAT DATASET ??
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In the 3.4 listing you can look up the Data set name type : parameter which is right below the secondary allocation listing. If that parm shows EXTENDED , then the dataset is an extended format dataset.
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Data set name type : EXTENDED
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I just noticed that your DS listing does not show it as extended. However your dataset is a multi-volumed dataset. place your cursor on the Volume Serial parm in the listing and press ENTER. It would bring up a pop up window with the number of volumes that the dataset is allocated.
I don't think you need to increase the space parameter as it already coded to handle more records.
Hope this helps...
Cheers
kolusu
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deepeshk79
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Joined: 20 Jun 2003
Posts: 112
Topics: 48
Location: Bangalore
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| Posted: Mon Sep 20, 2004 9:42 am Post subject: |
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Hi Kolusu,
Yeah as u said in our DS listing we have
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1st extent cylinders: 250
Secondary cylinders : 100
Data set name type : SMS Compressible . : NO
Creation date . . . : 2004/09/17 Referenced date . . : 2004/09/20
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The Data set name type is blank, it does not indicate if it is extended or not. Yes the DS is multi volume.
Thanks,
Deepesh |
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bablack
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Joined: 04 Dec 2002
Posts: 71
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Location: Little Falls, NJ
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| Posted: Thu Sep 30, 2004 9:14 am Post subject: |
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Your ds appears to be a standard sequential dataset. If it is multi-volume, you get 16 extents PER VOLUME. On the secondary volumes, they should all be the secondary allocation size of 100 cylinders, so you could get up to 1600 cylinders per volume (up to 1750 on the first volume).
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MikeBaker
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Joined: 04 May 2004
Posts: 96
Topics: 9
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| Posted: Thu Sep 30, 2004 4:57 pm Post subject: |
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The '+' sign next to your Volume Serial indicates that it is a multi-volume dataset. When you select the dataset ('S') via 3.4, do not PF3 out of it after looking, but just hit [enter] again, and it will show you the other volumes.
To see for yourself the difference and how this works, do:-
Test 1: allocate a dataset with SPACE=(CYL,(50,50))
Test 2: allocate a dataset with SPACE=(CYL,(50,50)),UNIT=(,9) |
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icon
Beginner
Joined: 10 Jun 2003
Posts: 5
Topics: 2
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| Posted: Wed Dec 06, 2006 2:29 am Post subject: |
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This thread is old but I have a similar issue as I am trying to increase space for this file.
This was created using CYL(8,3), how can this allocate 118 cylinders?
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General Data Current Allocation
Management class . . : MCSEAP Allocated cylinders : 118
Storage class . . . : SCSEAP Allocated extents . : 38
Volume serial . . . : SEAP03 +
Device type . . . . : 3390
Data class . . . . . : **None** Current Utilization
Organization . . . : PS Used cylinders . . : 118
Record format . . . : FB Used extents . . . : 38
Record length . . . : 250
Block size . . . . : 23250
1st extent cylinders: 7
Secondary cylinders : 3
Data set name type : SMS Compressible : NO
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This was created using CYL(110,3) based on computation of how many cylinders it will use up taken from this link.
http://www.mvsforums.com/helpboards/viewtopic.php?t=28
| Code: | General Data Current Allocation
Management class . . : MCSEAT Allocated cylinders : 118
Storage class . . . : SCSEAT Allocated extents . : 10
Volume serial . . . : SEAT04
Device type . . . . : 3390
Data class . . . . . : **None** Current Utilization
Organization . . . : PS Used cylinders . . : 118
Record format . . . : FB Used extents . . . : 10
Record length . . . : 250
Block size . . . . : 23250
1st extent cylinders: 93
Secondary cylinders : 3
Data set name type : SMS Compressible : NO
Creation date . . . : 2006/12/06 Referenced date . . : 2006/12/06
Expiration date . . : ***None*** |
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kolusu
Site Admin
Joined: 26 Nov 2002
Posts: 12378
Topics: 75
Location: San Jose
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| Posted: Wed Dec 06, 2006 5:39 am Post subject: |
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icon,
Read bablack and mike baker's response which are just above your post.
Kolusu
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icon
Beginner
Joined: 10 Jun 2003
Posts: 5
Topics: 2
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| Posted: Thu Dec 07, 2006 12:04 am Post subject: |
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kolusu,
I did but am still not clear on this. appreciate some clarification on this.
I checked the file and it sits on 3 volumes. Is this what happens?
vol1 = 7+16*3 = 55
vol2 = 16*3 = 48
vol3 = 16*3 = 48
total possible space of 151 cylinders?
What btw made it multi-volume? is it an installation default? the rest of my jcl goes
UNIT=3380,VOL=SER=SEA005 |
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Nic Clouston
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Joined: 01 Feb 2007
Posts: 1075
Topics: 7
Location: At Home
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| Posted: Thu Feb 08, 2007 11:54 am Post subject: |
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| Quote: |
1st extent cylinders: 93
Secondary cylinders : 3
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A point to note - your 1st extent is only 93 cylinders - not 110. Your primary space request is taking more than 1 extent because space is fragmented (cannot find 110 contiguous cylinders)
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Utility and Program control cards are NOT, repeat NOT, JCL. |
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