Apologies if this is the wrong category but wanted to get an idea about the kind of the VM resources others are using when running NodeBB.

Our current forum is v3 and we're using MongoDB (DB size is around 2.5). We have around all time 12K users (average active guest+users # at a given time is around 50-100). There's around all time 30K topics, and about 100K daily page visits.

We've been running MongoDB as a 3-replica-instance setup and has worked very well so far. (Dedicated VM for Nodebb, dedicated VM for 1x MongoDB PRIMARY instance, and one more VM for 2x MongoDB SECONDARY instances)

We have been trying to upgrade the forum to v4 a few times now (DB size increases to around 5.5GB from 2.5GB).

However, due to Mongo issues (Data syncing across replica sets, allocated resources not being enough etc sometimes), once upgraded, the DB setup has failed and we have had to keep our current v3 setup so far.

We are now exploring the option of getting rid of our current 3-replica-instance setup and use only one Mongo instance.

However, before we proceeded/tested, I would like to get an idea if anyone has similar experience running a forum of around the same/larger specs and which kind of resources have been allocated(CPU/RAM/SWAP etc) for running a dedicated MongoDB instance.

Thank you!