just hope to get some advice on how to plan 15000 users who locates in two major cities?
currently planning to have:
1 server for major LDAP
1 server for MTA + Mailbox(for users in location1), plus one external storage
1 server for LDAP replica
1 server for MTA + Mailbox(for users in location2), plus one external storage
by the way, how about the disaster recovery? any advice on this?