How do you replicate a table across multiple Mnesia nodes?

Replication is set up simply by listing more than one node in a table's storage type option when creating (or later reconfiguring) the table — Mnesia then keeps all listed nodes' copies in sync automatically as part of every transaction.

mnesia:create_table(session,
    [{disc_copies, [nodea@host1, nodeb@host2, nodec@host3]},
     {attributes, [id, user, expiry]}]).

Every write inside a transaction is propagated to all listed nodes as part of that same transaction's commit, using two-phase commit coordination so all replicas agree before the write is considered durable. To add a new replica to an already-running table, mnesia:add_table_copy/3 lets you extend replication to another node without recreating the table from scratch, copying the existing data to the new node as part of that operation.

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