Starting with ONTAP 9.7, FlexCache volumes are supported on MetroCluster configurations. You should be aware of requirements for manual repeering after switchover or switchback operations.
After a negotiated or unplanned switchover, any SVM FlexCache peering relationship within the cluster must be manually configured.
For example, SVMs vs1 (cache) and vs2 (origin) are on site_A. These SVMs are peered.
After switchover, SVMs vs1-mc and vs2-mc are activated at the partner site (site_B). They must be manually repeered for FlexCache to work using the vserver peer repeer command.
For FlexCache relationships to a cluster outside of the MetroCluster configuration, the peering must always be manually reconfigured after a switchover if the involved clusters are in disconnected mode during switchover.
For example:
When switchover is triggered, and if site_A and site_C are not connected, you must manually repeer the SVMs on site_B (the switchover cluster) and site_C using the vserver peer repeer command after the switchover.
When switchback is performed, you must again repeer the SVMs on site_A (the original cluster) and site_C.