Database upgrade from 2.4 to 4.2

[mohit_gour]

Hello All,
I have a MongoDB database server running on 2.4 version. it consists around 90 dbs with total size of 4.5 TB.
so i want to migrate these databases on new infrastructure with version 4.2.

Question:-

• Best way to backup my 4.5 TB dbs and restore it on 4.2 version?(mongodump will take days)
• Can we restore 2.4 version full backup on 4.2 version?

Thanks

[chris (Chris Dellaway)]

Welcome @mohit_gour

There are so many changes across the 7! major version updates I would not be comfortable with a dump/restore(even it worked) without rigorous testing.

There a couple of threads on this topic.

Upgrade advice from 2.6.11 to 4.2.6 (current)

I’ve inherited a project that is woefully behind migrating from Windows Server 2008 r2. I’m new to mongoDB, but from reading the release notes it appears as though the migration path is 2.6.11 -> 3.0.15 -> 3.2.22 -> 3.4.24 -> 3.6.18 -> 4.0.18 -> 4.2.6. Is this correct or is a shorter path possible? It also seems that it is just a matter of Stop the database. Upgrade the binaries Start the database Repeat 1-3 until done Anything else I should know or look out for? Thanks, Scott

Automated upgrading of MongoDB deployments

We have recently been having a lot of struggle finding a good way to automatically upgrade an existing mongo database across multiple major versions. Due to time constraints the short term emergency solution seems to be to pin the MongoDB version. But this is not a long term solution. Are there any thoughts or plans regarding MongoDB’s ability to move across multiple major versions in one update? The system we are working on is a distributed system, with alot of servers involved, so manually ste…

[Valery_Khamenya]

@chris, I’m not the topic originator, but first of all many thanks for those links!!

I’ve spent like half a day to google out something clear and relevant on upgrade from 2.x to 4.x!

Now I’ve found this topic and tried to google out the title of this topic ==> No results found for “Database upgrade from 2.4 to 4.2” Boaaah. I don’t know if it is OK not to have robots.txt on the domain root, but having Google Page Rank 0 (Zero!) for domain root of this forum is something really wrong…

The main page also became more like scam-page if I compare to the great informative design of ~2010 as I remember it. Indeed, the main page proposed me to sign-in – Okay – but then I found me on MongoDB related cloud business… Guys. it is like 20 year old aggressive marketing style…

Whatever… @chris said that, thank you for you answer a lot!!

[chris (Chris Dellaway)]

Welcome @Valery_Khamenya and you’re welcome.

There is a category for site feedback. I suggest that would be a good spot to make a post as the appropriate people would be more likely to see it in that category.