How to make a distributed file storage for windows fileshare, taking into account several offices?

Question

File systems

Good health! my question is similar to this one.
There are three offices, the network between them is about 10Mbps.
There is some windows server fileserver.
Task: to make files available in a certain fileshare in different offices, so that the data is the same everywhere, but local in relation to the office.
where to look?
doing stupidly mirror or rsync files does not make sense, since there will be collisions, in different offices different users can work with the same file, it is permissible and not at the same time, then a lock should work for this.
every office has proxmox. you can start at least ceph, at least glusterfs, or any other option. I still can’t logically figure out what to try to implement it on, and what problems there will be with this.

Answer 1

The main gag in this is the file lock.
DFSR quite solves the problem of file replication and even works tolerably on slow channels with high latency, but in the case of simultaneous operation, the last copy will be saved and replicated.
Try to understand what data and how employees work. It may turn out that the probability of a simultaneous change will be for 3-4 employees in 3-4 files, ala 3 secretaries are sitting and incoming paper correspondence is registered in an excel file.

Answer 2

Have you considered dfs?