Is Ejabberd clustering could work with ODBC (i.e. mod_roster_odbc, mod_vcard_odbc, mod_offline_odbc, mod_last_odbc) rather than Mnesia?
As I may guess from discussion here (http://www.ejabberd.im/node/1300) it's impossible...
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Clustering with ODBC?
Submitted by Alex Pinsker on Sun, 2007-04-29 12:40
It should be possible
On that page Tarick posts questions he has. But I don't read any mention of not possible clustering with ODBC/PostgreSQL/MySQL.
It should be possible to cluster ejabberd server, and use PostgreSQL for some tables.