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A system downgrade is a user controlled downgrade to an older version of Image Added.               

This procedure can be used after a simplified upgrade. 
To revert to a previously installed version, execute the following procedure:

  1. Ensure that the environment variables are set correctly:

Variable

Description

MZ_HOME

This environment variable specifies where the software is installed.

JAVA_HOME

This environment variable specifies where the JDK is installed.

PATH

This environment variable specifies where the search path must contain the following directories:

$JAVA_HOME/bin:$MZ_HOME/bin

Info

Example - Extracting the Upgrade Software


Code Block
languagetext
themeEclipse
$ export MZ_HOME=/opt/mz 
$ export JAVA_HOME=/opt/jdk/jdk-17.0.2 
$ export PATH=$JAVA_HOME/bin:$MZ_HOME/bin:$PATH


  1. Disable all workflow groups, either from the Execution Manager in Desktop, or by entering the following command:

    Code Block
    $ mzsh mzadmin/<password> wfgroupdisable \*
    Note
    titleNote!

    If you use the wfgroupdisable command, make sure that you enable all system tasks again when you are done.

  2. Stop all workflows.
     

  3. Shut down all connected Desktops.
     

  4. If you want to see which Desktops that are connected, you can use the following command:

    Code Block
    $ mzsh mzadmin/<password> pico -view
    Note
    titleNote!

    This command will also display other pico instances, such as ECs.

  5. Shut down the Platform and all ECs.

    Code Block
    $ mzsh shutdown platform <ec name>  ...

  6. Remove MZ_HOME.

    Code Block
    $ rm -rf $MZ_HOME

  7. Restore the backup of MZ_HOME.

    Code Block
    $ cp -r <backup directory> $MZ_HOME

  8. If you are downgrading a system not using Derby, restore the database backup.

Note

Note!

If you are using SAP HANA as the Platform database, you will need to disable TLS/SSL on the SAP HANA database before you downgrade your Platform.

Resume Workflow Execution

  1. Set the environment variables JAVA_HOME and PATH according to the system requirements of the restored version.

Note

Note!

You must rollback to Java 8 before you downgrade to Image Added 8.3 or earlier. 

Info

Example - Setting Environment Variables


Code Block
languagetext
themeEclipse
$ export MZ_HOME=/opt/mz  
$ export JAVA_HOME=/opt/jdk/jdk1.8.0_121  
$ export PATH=$JAVA_HOME/bin:$MZ_HOME/bin:$PATH


  1. Start the Platform and all ECs.

    Code Block
    $ mzsh startup platform <ec names>  ...

  2. Import the configurations that were exported in the old version prior to the upgrade.      

    Code Block
    $ mzsh mzadmin/<password> systemimport <backup directory>/<filename>

  3. Start the real-time workflows.
     

  4. Enable the Workflow Groups.

    Code Block
    $ mzsh mzadmin/<password> wfgroupenable \*
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