State Snapshot Transfer (SST) is used in Percona XtraDB Cluster (PXC) when a new node joins the cluster or to resync a failed node if Incremental State Transfer (IST) is no longer available. SST is triggered automatically but there is no magic: If it is not configured properly, it will not work and new nodes [&]

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http://www.percona.com/blog/2014/12/30/diagnosing-sst-errors-with-percona-xtradb-cluster-for-mysql/