A distributed memory object caching system
http://www.danga.com/memcached/
http://repcached.lab.klab.org/
Memcached and facebook: http://edwink.devhd.com/2008/01/05/mysql-memcached-and-replication/
PHP client http://pecl.php.net/package/memcache
memcache 3.x should support ini option:
memcache.redundancy = 1
memcache.session_redundancy = 2
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