Dell EqualLogic PS6100 series Configuration Manual page 128

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Temporary Promotion: Promote Read/Write with an ability to demote. However all writes are lost
when container is demoted to resume replication from primary site.
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Permanent Promote: Promote Read/Write in case primary site or container is not available and
clients need to be failed over to secondary site. All writes are preserved
March 2013 Dell EqualLogic Configuration Guide v14.1 12-119