Validations That Occur Before a Switchover

When a switchover is initiated by using the geopg switchover command, the data replication subsystem runs several validations on both clusters. The switchover is performed only if the validation step succeeds on both clusters.

First, the replication subsystem checks that the SRDF device group is in a valid aggregate RDF pair state. Then, it checks that the local device group type on the target primary cluster, cluster-newyork, is RDF2. The symrdf -g device-group-name -query command returns the local device group's state. These values correspond to a RDF1 or RDF2 state. The following table describes the SRDF command that is run on the new primary cluster, cluster-newyork.

Table 4-1  SRDF Switchover Validations on the New Primary Cluster

RDF Pair State SRDF Switchover Command That Is Run on cluster-newyork Synchronized Suspends the RDF link. R1Updated, Failedover, Suspended The symrdf swap command switches the role. Other RDF pair states No command is run.