Re: V2R3 CISC to V4R2 RISC - Do we dare?

[Rob Berendt <rob@xxxxxxxxx>]

We haven't done the V2R3 to V4R2.  We've done V3R2 to V4R2.  Follow the steps 
of the 'Roadmap for changing to Power PC technology' very carefully.  Since 
we've done many CISC-to-RISC upgrades we have our own instructions written down 
that go along with the book.  Our instructions are tailored for the individual 
machine, and the upgrade path chosen.  For example:  side-by-side, 
unload/reload, etc.

I don't know if the tools that estimate disk space include the huge files IBM 
builds once you move from V2R3 up.  For example.  One of our AS/400's has many, 
many objects.  When we upgraded CISC-to-CISC from V2R3 to V3R2 we lost about a 
gig of space.  Yes that was one gig.  This space could be traced to a half 
dozen objects that IBM created for database cross reference.  It seems that 
IBM's, and other developers, didn't like having to use API's or things like the 
command DSPFFD to find out what fields were in files.  So IBM stores all of 
this in files now and they can just access those.  If you've a dozen or so sets 
of BPCS on your system it doesn't take long to make these files huge.  And boy 
is it fun when they get corrupted.  Hence the new parameter for RCLSTG  
SELECT(*DBXREF).  One the S20-2163 that takes one hour, versus 14 hours for 
RCLSTG SELECT(*ALL).  At one time I heard that if you delete them it just 
rebuilds them.  I'm afraid that, as operating system releases have gone by, 
that the dependence has grown on these files and I would be loathe to delete 
them.

Check this out:
 Library     Object      Object           Object   Text description             
 
                         Type             Size                                  
 
 QSYS        QADBIFLD    *FILE     1,674,665,984   Cross reference physical 
file 
 QSYS        QADBIATR    *FILE       190,861,312   Cross reference logical file 
 
 QSYS        QADBILFI    *FILE       171,986,944   Cross reference logical file 
 
 QSYS        QADBILLB    *FILE       110,145,536   Cross reference logical file 
 
 QSYS        QADBXREF    *FILE        48,410,624   Cross reference physical 
file 
 QSYS        QADBKFLD    *FILE        47,239,168   Cross reference physical 
file 
 QSYS        SSA         *USRPRF      45,129,728   Group profile for BPCS       
 
 QSYS        QADBFDEP    *FILE        16,830,464   Cross reference dependency 
fi 

Whenever you use the SQL command CREATE COLLECTION to build a library it will 
build logical files over these physicals and store them in the new library you 
created.
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