Comment 12 for bug 1098566

For documentation,
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This requires sst-special-dirs to be set under [sst] in cnf file to either 0 or 1. 0 being the default. Also, innodb-data-home-dir and/or innodb-log-group-home-dir need to be defined in my.cnf under [mysqld]. Percona Xtrabackup 2.1.6 or higher is required.
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