*REBLD LFs Not 'Shrinking'

In order to conserve DASD, I have most of our infrequently used logical
files set as *REBLD access path maintenance.  My experience has been
that a logical file may have an object size of say 62K when it is not in
use.  When the file is opened the object size will grow but it will
return to the 62K when the file is closed.  Over the last little while,
I have noticed that after the file has been freed, the object size of
the file does not 'shrink'.

We are running V4R1 on an S10 (development) and a 620 (production).
I've seen this behaviour on both systems.  Both systems are at PTF level
98013.  

I have historical object size figures for the production machine which
we upgraded to the 620 from CISC this past December.  Shortly after the
upgrade, we started using ILE with activation groups.  A typical file
was showing as consistently 62K in size.  Since March, the object has
gone from 75MB to it's current 159MB.  (Unfortunately, I do not have the
figures for prior to March and after the RISC upgrade).  Currently, the
last used date for the LF is April 29.  We IPL each weekend so we have
done one IPL since the last used date.  The physical file the logical is
based on is used all the time and has many other dependant LFs.  The PF
is probably open in one job or another, or through one LF or another for
the whole week.

Sorry for getting a little long-winded here but I'm almost done.  Is
this a 'feature' of V4 of OS400 or is this related to the use of the
activation groups?

Appreciate any input.

TIA

Gord

-- 
Gord Hutchinson
TST Overland Express
ghutchinson@tstoverland.com
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