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Ensure that the environment variables are set correctly:

VariableDescription
MZ_HOMEThis environment variable specifies where the software is installed.
JAVA_HOMEThis environment variable specifies where the JDK is installed.
PATHThis environment variable specifies the search path and must contain the following directories: $JAVA_HOME/bin:$MZ_HOME/bin

Example - Setting Environment Variables

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

Note!

If the software is installed on a GlusterFS storage, you must also set the environment variable IGNORE_TAR_EXIT to true. This will suppress non-critical errors that are caused by the tar command during downgrade. If these errors are not suppressed, the downgrade process will abort.

Example - Setting Environment Variable

$ export IGNORE_TAR_EXIT=true
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