Hi
We've done Master Master replication for customers with a great deal of success.
Although A2Billing does use auto-increment in many tables, you can easily configure MySQL to put auto-increment odd numbers on one database, and even numbers on the other.
We would advise that only one database is referred to, using the second as a backup, just in case for any reason the replication breaks, as it's difficult to re-combine the data when the databases are out of sync, but you can easily switch from one to the other should your main MySQL server fail.
Joe
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