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doc: added note about monitor ips update during failover #4501

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doc: added note about monitor ips update during failover #4501

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7 changes: 7 additions & 0 deletions docs/design/proposals/clusterid-mapping.md
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Expand Up @@ -178,3 +178,10 @@ operation from the primary cluster to a remote cluster. The existing volumes
that are created on the remote cluster does not require any mapping as the
volumeHandle already contains the required information about the local cluster (
clusterID, poolID etc).

**Note:-** To use a mirrored and promoted RBD image on a secondary site during a
failover, you need to replace the primary monitor addresses with the IP
addresses of the secondary cluster in the ceph-csi-config. Otherwise, Ceph-CSI
won't be able to use the volumes, and application pods will become stuck in the
`ContainerCreating` state. Thus, during failover, both clusters will have the
same monitor IP addresses.