https://oracledbwr.com/enabling-archive-log-mode-in-oracle-19c-rac-database/

https://stevecao.wordpress.com/2019/08/08/step-by-step-guide-on-installing-rac-19c-on-rhel7-6-part-3/

https://www.youtube.com/watch?v=NUcBMzj5QDI&list=PLpm71E6Qw2tBg50-rYp78gUN93zihe_H6&index=11 https://infohub.delltechnologies.com/l/design-guide-oracle-rac-database-on-powerstore-t-storage/deploying-oracle-19c-rac-with-red-hat-enterprise-linux-8-2-on-vsphere-7

https://alfredokriegdba.com/2013/06/13/why-my-new-disk-group-is-not-getting-mounted-automatically-when-asm-instance-starts/

https://wadhahdaouehi.tn/2019/05/set-up-dns-for-rac-on-oracle-linux-7/

https://saneshdba.blogspot.com/p/srvctl-commands-in-oracle-rac-srvctl.html

After upgrade to 12c, check if sqlnet.ora has below information SQLNET.ALLOWED_LOGON_VERSION_SERVER = 8 SQLNET.ALLOWED_LOGON_VERSION_CLIENT =…