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deepak.kec
New User
Joined: 26 Feb 2007
Posts: 71
Location: bangalore
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| I have compressed a PDS. Is there any way to know by how much %age dataset has been compressed. |
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Anuj Dhawan
Superior Member
Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
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| deepak.kec wrote: |
| I have compressed a PDS using a JCL. |
using what . . . PKZIP, SLiKZip, GZip . . .and what does their respective documentations have to say? |
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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| Look at the statistics before and after |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
| Quote: |
| using what . . . PKZIP, SLiKZip, GZip . . . |
Probably none of these. . . I suspect this compress was to remove "dead" space. |
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deepak.kec
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Joined: 26 Feb 2007
Posts: 71
Location: bangalore
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hi,
I have used IEBCOPY to compress the dataset. |
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Anuj Dhawan
Superior Member
Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
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Hi,
Just executed one IEBCOPY Job to compress a PDS, in SYSPRINT I got something like:
| Code: |
FCO290I ALL MEMBERS WERE ALREADY IN PLACE
FCO160U MEMBERS 104 TOTAL 104 IN-PLACE 0 MOVED
FCO170U DIR BLKS 100 TOTAL 18 USED 82 UNUSED
FCO180U TRACKS 30 TOTAL 30 USED 0 UNUSED
FCO190U EXTENTS 1 TOTAL 1 USED 0 UNUSED
FCO195U BYTES ON LAST TRACK 46070 USED 12716 UNUSED
FCO200U EXCPS 3 TOTAL 3 INPUT 0 OUTPUT
FCO215U COMPRESS HAS REGAINED 0 TRACKS 0 BYTES OF WASTED SPACE |
is this not enough? Are you getting something like this? |
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Gnanas N
Active Member
Joined: 06 Sep 2007
Posts: 792
Location: Chennai, India
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Hi Anuj,
It seems you have CA-PDSMAN there which is a replacement of IEBCOPY. |
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deepak.kec
New User
Joined: 26 Feb 2007
Posts: 71
Location: bangalore
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Hi,
I am compressing the load module using the IEBCOPY utility and wanted to check with u guys is there any effective way to compress other than this.
Since there way very little space freed using IEBCOPY utility. |
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Gnanas N
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Joined: 06 Sep 2007
Posts: 792
Location: Chennai, India
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Anuj Dhawan
Superior Member
Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
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Hi Gnanas,
| Gnanas N wrote: |
| It seems you have CA-PDSMAN there which is a replacement of IEBCOPY. |
My point was SYSPRINT can be a place to start with. . . |
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dbzTHEdinosauer
Global Moderator
Joined: 20 Oct 2006
Posts: 6966
Location: porcelain throne
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can pds-e's be used for recfm=U (load modules, etc...)?
if so, then you don't have a compression problem. |
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Robert Sample
Global Moderator
Joined: 06 Jun 2008
Posts: 8696
Location: Dubuque, Iowa, USA
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| Quote: |
I am compressing the load module using the IEBCOPY utility and wanted to check with u guys is there any effective way to compress other than this.
Since there way very little space freed using IEBCOPY utility. |
The amount of space recovered will depend upon how many members have been updated since the file was created or last compressed; if only a couple of members have been updated, that's all the space you can get back. And using a different utility won't change the results -- IEBCOPY is pretty much state-of-the-art as far as load module compressing goes.
If you understand the layout of a PDS, you'll understand why a compress is a compress is a compress -- and why a compress might not recover any space at all. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
If you have successfully run a compress and the pds is still nearly full, suggest you make the pds larger. . . |
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deepak.kec
New User
Joined: 26 Feb 2007
Posts: 71
Location: bangalore
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hi dick,
how to make the existing PDS large? |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
One easy way is to allocate a new, larger pds and copy the contents of the original to the new dataset. Once the copy is done, rename the original dataset to some other name and rename the new dataset to the original name.
You may need to do this during a maintenance window when regular jobs are not being run. |
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