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1. Ensure that the environment variables are set correctly:

   Excerpt
   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 the search path and must contain the following directories: $JAVA_HOME/bin:$MZ_HOME/bin

   Info
   title Example - Setting Environment Variables
   Code Block language text theme Eclipse export MZ_HOME=/opt/mz export JAVA_HOME=/opt/jdk/jdk-17.0.2 export PATH=$JAVA_HOME/bin:$MZ_HOME/bin:$PATH

   Note
   title Note!
   You must specify the Java version required for the version that you are upgrading from.

2. Make a backup Make a system export of all your configurations with System Export.

   Code Block
   language text
   $ mzsh mzadmin/<password> systemexport <backup directory>/<filename>

   Note
   title Note!
   These configurations must be imported after the upgrade.

3. For safety, make an online backup of the database(s). For information about how to perform an online backup, see Preventive Maintenance Procedures.
    

   If you are performing an upgrade of a system with large configurations, you may need to increase the maximum number of file descriptors.

   Info

   title	Example - Changing the Maximum Number of File Descriptors on Linux.

   Code Block

   language	text
   theme	Eclipse

   $ cat /proc/sys/fs/file-max 5000 $ su - root Password: $sysctl -w fs.filemax=10000

   Backup and Disaster Recovery Procedures.