Validations That Occur Before a Takeover

When a takeover is initiated by using the geopg takeover command, the data replication subsystem runs several validations on both clusters. These step are conducted on the original primary cluster only if the primary cluster can be reached. If validation on the original primary cluster fails, the takeover still occurs.

First, the replication subsystem checks that the EMC Symmetrix Remote Data Facility device group is in a valid aggregate RDF pair state. The EMC Symmetrix Remote Data Facility commands that are used for the takeover are described in the following table.

Table 3–2 EMC Symmetrix Remote Data Facility Takeover Validations on the New Primary Cluster

Aggregate RDF Pair State	Protection Group Local Role	EMC Symmetrix Remote Data Facility Takeover Commands That Are Run on cluster-newyork
FailedOver	Primary	symrdf $option $dg write_disable r2 symrdf -g dg suspend symrdf $option $dg rw_enable r1
FailedOver	Secondary	No command is run.
Synchronized, Suspended, R1 Updated, Partitioned	All	symrdf -g dg failover