Running OS/400 V5R1 Applications on another machine running OS/400 V5R4

115 pts.
Tags:
OS/400 and iSeries
I have an AS/400 machine 9406-500 running OS/400 V5R1 and another iSeries system 9405-520 running V5R4. I wanted to port some of the applications from those in the V5R1 environment to my second iSeries machine on V5R4. I thought that I can achieve this objective if I can create a logical partition in my second iSeries machine to run my V5R1 applications. But was told that the minimum OS400 level that can be accommodated on my iSeries 9405-520 machine is V5R3! Where can I find authoritative sources to confirm this? Or if someone can help with advices how i can achieve the objective of running my V5R1 applications on my iSeries machine running V5R4. Grateful for any advices.

Software/Hardware used:
porting applications from AS/400 model 9406-500 to AS/400 model 9405-520

Answer Wiki

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Is there any reason you cannot make the changes to on the V5R1 box?

What are the changes?
Are there any program changes that need to go back?

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  • CharlieBrowne

    You should be able to run V5R1 applications on a machine that is running V5R4. IT is when you go the other way that you may have an issue. For instance, it you are use newer features and try to go back to an old release, you would have problems.

    I would just transfer the application over to the V5R$ box. Either in new libraries or in a new LP.

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  • CharlieBrowne

    Once you do that, please come back and either let us know it worked OK or if there are issues, then we can assist you in resolving them.

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  • TG1819456
    Dear Mr CharlieBrowne..one of my staff seemed to agree with you as to transferring the V5R1 applications over to the V5R4 box. But then I checked a page on an IBM Redbook that the minimum OS version that can run on our iSeries 9405-520 is V5R3. Let me try on your suggestions and shall let you know the outcome. Many thanks for your advice.
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  • TG1819456

    hi Mr CharlieBrowne..Just check with our guys and confirmed that as you indicated that porting the V5R1 application objects and database files over to the V5R4 machine will work .. but the problem is after we made changes to the database files in the V5R4 machine environment we need to transfer them back to the original V5R1 machine .. apparently the save and restore feature on the 9405-520 OS/400 V5R4 machine indicated that the lowest OS is V5R2M0 ..


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  • CharlieBrowne

    Is there any reason you cannot make the changes to on the V5R1 box?

    What are the changes?
    Are there any program changes that need to go back?
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  • TG1819456

    this would mean that we cannot let the V5R1 applications access and use the updated files from the V5R4 machine .. is there a way to overcome this problem?.. many thanks again

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  • TG1819456
    the reason is that one of our branches is using the older 9406-500 machine with the V5R1 and it is not convenient at this moment for them to move up the next version of V5R4 .. the machine with V5R4 is now being used as a backup for this V5R1 system ..
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  • CharlieBrowne

    If you can make the same changes to the files on the V5R1 machine, you can try other options to get the data over to the other box.

    If the files are not to large, you may try to create a DDMF. I am not sure if you can do that between two boxes with the release differences. But it only takes a moment to try it.

    Another option is to convert files to another format and use FTP to get them across and copy them back.

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  • TG1819456

    as such, the applications on both systems environment will be the same .. and if the DB/2 databases are compatible on both systems, our problem will be solved

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  • CharlieBrowne
    If it is just for backup, can you just save to a SAVF and ftp that to the IFS or another server. That should work for you.
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  • TG1819456
    we have tried using FTP to transfer the files as you indicated but when restore back onto the V5R1 environment .. we got the following msg "File cannot be restored, displayed, or listed. The file was saved from a more recent release of the OS"
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  • CharlieBrowne
    did you save it to the IFS?
    If so and it was an issue, try to FTP the *SAVF to a different server *NonAS400". That should be able to be restored. 
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  • TG1819456

    Unfortunately we do not just transfer the SAVF to IFS and save it there. This is ok. It is only when we have to work on the files when they are moved to the V5R4 machine. After we have made some changes to the files in the V5R4 machine, we need to transfer and restore them back to the V5R1 machine and this is where we cannot restore them back onto the V5R1

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  • CharlieBrowne
    Why can you not make the changes on the V5R1 machine?
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  • TG1819456

    After some discussion, we will try your IFS approach and let you know the outcome as soon as we have done it ..

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  • TG1819456
    we tried but still with the same msg "file cannot be restored, displayed or listed" as before .. Since we have to make changes to the file in the V5R4 environment, the lowest Target Release that we can save the file back to is V5R2. This SAVF can be transferred back to the V5R1 machine but it cannot be restored to the system due to "The file was saved from a more recent release of the operating system .."
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  • CharlieBrowne
    Yes,If you have to make the changes on the V5R4 machine; you cannot get that file back to the V5R1 machine.
    The FTP to the IFS was to resolve a backup issue. What you save to the IFS should be able to be restored  if not changes are made.
    What type of "Changes" are you referring to that need to be done on the V5R4 machine?
    If it is adding new fields, you would need to make that same change on the V5R1 machine.
    Then to get the data back you need to get the data to the IFS with CPYTOIMPF . Then FTP that IFS file to the V5R1 machine's IFS. Lastly do a CPYFRMIMPF to replace the data in the production file.
    Does that make sense?
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  • TG1819456
    hi sorry we didn't get back to you promptly yesterday to try out your suggestions to use CPYTOIMPF and CPYFRMIMPF .. we have not done it yet .. will do it sometime later tomorrow, and will let you know the outcome .. many thanks so far for your help and advices
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  • CharlieBrowne
    Thanks for the update.
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