When a write query is sent to Percona XtraDB Cluster all the nodes store the writeset on a file called gcache. By default the name of that file is galera.cache and it is stored in the MySQL datadir. This is a very important file, and as usual with the most important variables in MySQL, the [&]

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http://www.percona.com/blog/2014/09/08/calculate-correct-size-percona-xtradb-clusters-gcache/