Hello,
main pros/cons:
- 1 central SEPM is much easier to manage (all clients, policies, logs, etc in a single place)
- the central SEPM should have better hardware to accept more load
- because you don't use replication, now you don't have SEP traffic between the locations, you will have it when all clients will connect to the single SEPM (you will need to set GUPs up)
- bigger central DB (if you will end up with more than 5,000 clients, you should use MS SQL Server instead of the embedded DB)
- with one only SEPM, you need to enforce your fail over and disaster recovery procedures since any issue on it will impact on bigger set of clients
how to:
if in total you have less than 5,000 clients:
- ensure the central SEPM (new or existing one) is in good shape (good hardware, OS patched, etc.)
- deploy the sylink.xml to all remote clients
- decomission the other SEPMs. You can manually export most of the policies from old SEPMs and import them into the central one.
- Set up regular DB or system backups to be ready in case of disasters.
If you have more than 5,000 clients:
- migrate or set up your central SEPM to use SQL Server DB
- you may connect more than one SEPM to the same SQL DB, hence better load balancing
- deploy the sylink.xml to all remote clients
- decomission the other SEPMs. You can manually export most of the policies from old SEPMs and import them into the central one.
- Set up regular DB or system backups to be ready in case of disasters
There might be some variations depending on some other details and needs of yours but, overall, the above procedure should be good for you.