Built two new test Mongodb environments using replication at release 3.4 to replicate my production environment. I need to upgrade as 3.4 no longer supported.
MongoDB running on local virtual machines on Linux using RHEL 7 and replicate between the two servers.
I upgraded from 3.4 to 3.6, 4.0, 4.2 then 4.4. I took backups with unique names before doing each upgrade and verified things work working proper after each upgrade.
To make sure I have a properly documented backout plan if needed for my production environment, I tried to restore from release 4.4 (or where ever the upgrade it at) to 3.4 using backups since if anything fails the desire is to go back to the beginning and try again later.
I’ve tried using file backups, using mongodump / mongorestore neither which are working.
Under MongoDB Atlas I wouldn’t be able to restore to previous versions.
Does this leave the only option is to follow the manual downgrade process?