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vrg-usage.md

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Volume Replication Group (VRG) usage

Protect application on cluster1

  1. Deploy cluster1 VRG with Spec.ReplicationState: primary in application's namespace
  2. Wait for cluster1 VRG Status.Conditions.ClusterDataProtected: true indicating application's Kube objects have been protected

Unprotect application

  1. Delete VRG with Spec.ReplicationState: primary to delete its Kube object replicas or Spec.ReplicationState: secondary to preserve them

Failover application from cluster1 to cluster2

  1. Fence cluster1 and cluster2 VRGs from each other's Kube object replicas
    • This is typically accomplished by network fencing
  2. Fence cluster1 and cluster2 VRGs from each other's volume data
    • For Async mode, this is typically accomplished by setting cluster2 VRG Spec.ReplicationState: primary
    • For Sync mode, this is typically accomplished by network fencing
  3. Deploy cluster2 VRG with Spec.ReplicationState: primary in the Namespace it was in and with the Name it had on cluster1
    • Kube objects are recovered from the first available replica store specified in VRG's Spec.S3Profiles containing a replica for its Namespace and Name
  4. Wait for cluster2 VRG Status.Condtions:
    • ClusterDataReady: true indicating its Kube objects have been recovered
    • DataReady: true indicating its volumes have been recovered
  5. cluster2 application protection resumes automatically

Failback/Relocate application from cluster2 to cluster1

  1. Set cluster1 VRG Spec.ReplicationState: secondary
  2. Undeploy cluster1 application
    • Its PVCs can finally be deleted once VRG is deleted in a subsequent step
    • This allows its Kube objects to be recovered in a subsequent step
  3. Delete cluster1 VRG
    • This allows its PVCs to finally be deleted
  4. Unfence cluster1 and cluster2 VRGs from each other's Kube object replicas
    • This is typically accomplished by network unfencing
  5. Unfence cluster1 and cluster2 VRGs from each other's volume data
    • For Async mode, this is typically accomplished by setting cluster1 VRG Spec.ReplicationState: secondary
    • For Sync mode, this is typically accomplished by network unfencing
  6. Wait for cluster2 VRG Status.Conditions.ClusterDataProtected: true
  7. Set cluster2 VRG Spec.ReplicationState: secondary
  8. Undeploy cluster2 application
    • Its PVCs can finally be deleted once VRG is deleted in a subsequent step
  9. For Async mode, synchronize volume data:
    1. Deploy cluster1 VRG with Spec.ReplicationState: secondary
    2. Wait for cluster1 VRG Status.Conditions.DataReady: true indicating its volume data are in-sync with cluster2's
  10. Delete cluster2 VRG
    • This allows its PVCs to finally be deleted
  11. Set, for Async mode, or deploy, for Sync mode, cluster1 VRG Spec.ReplicationState: primary to recover its volumes and Kube objects
  12. Wait for cluster1 VRG Status.Condtions:
    • ClusterDataReady: true indicating its Kube objects have been recovered
    • DataReady: true indicating its volumes have been recovered
  13. cluster1 application protection resumes automatically