Oracle Database 11g/18c: Installing 11gr2 on 18c (Things to Keep in Mind)

In this blog I list out key things to keep in mind when doing installation of 11gR2 on 18c Cluster
This can be a useful case when you are thinking of migrating and Upgrading your infrastructure.


1. Keep Note of all the rpms and create a superset of both lists of 18c and 11g.
elfutils-libelf-devel.x86_64 is the rpm which is missing from 18c install. 

2. Prefer ASM LIB always for installation 
For RHEL - the kmod-oracleasm is available from RHN or in the Product DVD
for other libraries use - https://www.oracle.com/technetwork/server-storage/linux/asmlib/rhel7-2773795.html

3. If you want to share some FS with your previous severs, remember to create the users/groups with same UID / GID.

4. In the Grid Installation 

• Patch using -applyRU option before installation
• Apply Bug Patch for 27912127 
• OJVM patch is not valid for Grid release (check the readme carefully)
• Redhat Network configuration for NTP

5. Before DB Binaries Installation, follow below docs - 

• RAC RDBMS Installation fails with Error:"PRVF-4037 : CRS is not installed on any of the nodes" (Doc ID 2315020.1)
• Error PRVF-4037 On Install Of Oracle Database 11.2 Binaries With 12.2.0.1 Grid Infrastructure (Doc ID 2302700.1)
• PRVF-4037 : CRS is not installed on any of the nodes (Doc ID 1316815.1)
• error in invoking target 'agent nmhs' of make file ins_emagent.mk while installing Oracle 11.2.0.4 on Linux (Doc ID 2299494.1)     
• Linux:CVU NTP Prerequisite check fails with PRVF-7590, PRVG-1024 and PRVF-5415 (Doc ID 2126223.1)          

And as always refer MoS for any other erros.