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    <p>Start your new node (<code>b@node</code>) <code>erl -sname b -mnesia dir '"/path/to/storage"' -s mnesia</code>. This starts a new ram_copies node called <code>b@node</code>.</p> <p>On your original node (<code>a@node</code>), at the erlang prompt execute <code>mnesia:change_config(extra_db_nodes, ['b@node']).</code> This will cause the original node to connect <code>b</code> to the mnesia cluster. At this point, <code>b@node</code> has joined the cluster but only has a copy of the schema.</p> <p>To make new the node <code>b@node</code> capable of storing disc copies, we need to change the schema table type on <code>b@node</code> from <code>ram_copies</code> to <code>disc_copies</code>. Run <code>mnesia:change_table_copy_type(schema, 'b@node', disc_copies).</code> on any node.</p> <p><code>b@node</code> only has a copy of the schema at this point. To copy all the tables from <code>a@node</code> to <code>b@node</code> and maintain table types, you can run:</p> <pre><code>[{Tb, mnesia:add_table_copy(Tb, node(), Type)} || {Tb, [{'a@node', Type}]} &lt;- [{T, mnesia:table_info(T, where_to_commit)} || T &lt;- mnesia:system_info(tables)]]. </code></pre> <p>This command may take a while to execute as it will copy the contents of each table over the network.</p> <p><code>b@node</code> is now an exact replica of <code>a@node</code>. You could modify that statement - replace the <code>Type</code> variable with <code>disc_only_copies</code> in the call to <code>mnesia:add_table_copy/3</code> in order to copy the tables but ensure they're on disc only.</p> <p>The <a href="http://www.erlang.org/doc/man/mnesia.html" rel="noreferrer">mnesia documentation</a> explains how to use the functions I've shown here.</p>
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    1. POHow to add a node to an mnesia cluster?
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    1. COmaybe you known answer for this question http://stackoverflow.com/questions/3702201/remove-not-exist-already-node-from-mnesia-clusterscheme
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    2. CODon't suppose you know the answer to this similarly-related question? http://stackoverflow.com/questions/13398632/creating-mnesia-disk-copies-of-existing-ram-table
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