Upgrading the version of IBM i typically requires no configuration changes to Zend Server for IBM i, but for 7.2 there is one configuration change and a minimum version requirement for Zend Server.
This article tells how to help insure that you have a smooth transition to 7.2 for your Zend Server.
Zend Server for IBM i any version, running on any supported version of IBM i prior to 7.2 with a planned upgrade to 7.2 or higher.
Step 1): Zend Server for IBM i version 7 is the earliest version compatible with 7.2. Zend Server for IBM i version 8.5.3 is the earliest version compatible with 7.3.
Step 2): When you upgrade IBM i to 7.2 or higher, please make sure to apply all available PTF groups. The following article tells how to verify that your groups are current:
Verify your IBM i PTF groups are current
Step 3): Please verify that the 5733SC1 Licensed Program version has updated to match the new OS version. This article tells how:
IBM i issues with 5733SC1, libssl.a, libz.a, libcrypto.a, or others
Step 4): Also, you must make a change to the Apache configuration due to a change in the Apache version. Apache 2.4 changes the usage of the include directive. This article will fill you in on the details:
After Upgrading to IBM i 7.2 or Higher, the ZENDPHP7 (or ZENDSVR6) Apache Instance Will Not Start