RE: Question on Object Size Differences Between Prod and Dev Systems

Yes, it's due to storage allocation. Years ago, I had the same question raised by an auditor. I reached out to IBM and got a response from Debbie Saugen - the backup/recovery expert. She had to reach out to the data management team and it was explained that, when restoring, the system knows how much to allocate for the object. But, over time and usage of the original object, there could have been many extents that changed the overall size.

Roger Harman
COMMON Certified Application Developer - ILE RPG on IBM i on Power



-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jim Oberholtzer
Sent: Sunday, June 15, 2025 9:34 AM
To: midrange-l@xxxxxxxxxxxxxxxxxx
Cc: midrange-l@xxxxxxxxxxxxxxxxxx
Subject: Re: Question on Object Size Differences Between Prod and Dev Systems

In line answers
Jim Oberholtzer
Agile Technology Architects

On Jun 15, 2025, at 11:17 AM, Richard Schoen <richard@xxxxxxxxxxxxxxxxx> wrote:

HI All,

I’m doing a library save/restore between two systems and seeing minor size difference on my source physical files and program objects.

Is this a normal occurrence ?

Yes since the storage is contiguous as opposed to fragmented. (Yes single level storage scatters things).

If so, how do you know the systems match ?

Restore information

I suppose the successful restore of the library with no errors is the main thing :-)

Yep!

Thoughts appreciated as I”m trying to do some object reconciliation between the two systems and apparently comparing object size doesn’t work.

I also see all the object statistics like last used date and change dates seem to get lost during restore. Is this normal ?

Yes since on that system, they have not been used and/or changed.

Thanks


Regards,
Richard Schoen
Web: http://www.richardschoen.net/
Email: richard@xxxxxxxxxxxxxxxxx<mailto:richard@xxxxxxxxxxxxxxxxx>


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