<notetype="important"> When data loss is not acceptable for a <photherprops="pivotal">Pivotal </ph>Greenplum Database cluster, master and segment mirroring must be enabled<photherprops="pivotal"> in order for the cluster to be supported by Pivotal</ph>. Without mirroring, system and data availability is not guaranteed<photherprops="pivotal">, Pivotal will make best efforts to restore a cluster in this case</ph>. For information about master and segment mirroring, see <xrefhref="../../intro/about_ha.xml#about_ha">About Redundancy and Failover</xref>.</note><p>For information about the utilities that are used to enable high availability, see the<i>Greenplum Database Utility Guide</i>. </p>