I'm assuming the Server Pac install (z/os 1.7) used copymod to populate 
the linklib originally.  There has been updates and deletes from 
maintenance being applied.  I did compress the library before my copymod 
test.  Copymod must be cleaning up some things in the process.  As I said 
earlier, we usually use copy rather than copymod unless circumstances 
require copymod (blksize changes, device changes etc.).

On Sat, 3 Mar 2007 08:13:51 -0700, Paul Gilmartin 
<[EMAIL PROTECTED]> wrote:

>In a recent note, George Dranes said:
>
>> Date:         Sat, 3 Mar 2007 07:39:25 -0600
>>
>> Thanks for the info.  Fortunately, I'm copying between 3390 devices only
>> so IEBCOPY without copymod should be fine.  I did try some tests, for
>> example I used copymod to copy my SYS1.LINKLIB and noticed the space
>> utilization decreased.  The linklib had been installed from a server pac
>> with a blksize=32760 and i was copying to a dataset with the same 
blksize
>> so I was confused by the utilization change.  Does copymod tidy up 
things
>> during the copy???
>>
>A couple possibilities:
>
>o Might the server pac have been created by IEBCOPY from a library
>  having a smaller BLKSIZE?
>
>o Might there have been vacancies in SYS1.LINKLIB due to deletion
>  of members during installation or subsequently?
>
>-- gil
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