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articles/sap/workloads/disaster-recovery-sap-hana-suse.md

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@@ -47,7 +47,7 @@ With SAP HANA HA provider [SAPHanaSR](./sap-hana-high-availability.md#implement-
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Failure of the third node won't trigger any cluster action. Cluster detects the replication status of connected sites and the monitored attribute for third site can change between SOK and SFAIL state. Any takeover tests to third/DR site or executing your DR exercise process should first place the cluster resources into maintenance mode to prevent any undesired cluster action.
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Example of a multi-target system replication system. For more information, see [SAP documentation](https://help.sap.com/docs/SAP_HANA_PLATFORM/4e9b18c116aa42fc84c7dbfd02111aba/2e6c71ab55f147e19b832565311a8e4e.html).
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![Diagram showing an example of an HANA scale-up multi-target system replication system.](./media/sap-hana-high-availability/sap-hana-high-availability-scale-up-hsr-multi-target.png)
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![Diagram showing an example of a HANA scale-up multi-target system replication system.](./media/sap-hana-high-availability/sap-hana-high-availability-scale-up-hsr-multi-target.png)
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1. Deploy Azure resources for the third node. Depending on your requirements, you can use a different Azure region for disaster recovery purposes.
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Steps required for the HANA scale-out on third site are mirroring steps to deploy the [HANA scale-up cluster](./sap-hana-high-availability.md#deploy-for-linux). Deploy the third node following the Azure infrastructure, operating system and HANA installation steps for first node of the Pacemaker cluster, with the following exceptions:
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Cluster detects the replication status of connected sites and the monitored attributed can change between SOK and SFAIL. No cluster action if the replication to DR site fails.
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</details>
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## HANA scale-out: Add HANA multi-target system replication for DR purposes
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With SAP HANA HA provider [SAPHanaSrMultiTarget](./sap-hana-high-availability-scale-out-hsr-suse.md#implement-hana-ha-hooks-saphanasrmultitarget-and-suschksrv), you can add a third HANA scale-out site. This third site is often used for disaster recovery (DR) in another Azure region. The Pacemaker environment is aware of a HANA multi-target DR setup.
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Failure of the third node won't trigger any cluster action. Cluster detects the replication status of connected sites and the monitored attribute for third site can change between SOK and SFAIL state. Any takeover tests to third/DR site or executing your DR exercise process should first place the cluster resources into maintenance mode to prevent any undesired cluster action.
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Example of a multi-target system replication system. For more information, see [SAP documentation](https://help.sap.com/docs/SAP_HANA_PLATFORM/4e9b18c116aa42fc84c7dbfd02111aba/2e6c71ab55f147e19b832565311a8e4e.html).
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![Diagram showing an example of an HANA scale-out multi-target system replication system.](./media/sap-hana-high-availability/sap-hana-high-availability-scale-out-hsr-multi-target.png)
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![Diagram showing an example of a HANA scale-out multi-target system replication system.](./media/sap-hana-high-availability/sap-hana-high-availability-scale-out-hsr-multi-target.png)
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1. Deploy Azure resources for the third site. Depending on your requirements, you can use a different Azure region for disaster recovery purposes.
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Steps required for the HANA scale-out on third site are mirroring steps to deploy the [HANA scale-out cluster](./sap-hana-high-availability-scale-out-hsr-suse.md#set-up-the-infrastructure). Deploy the third site following the Azure infrastructure, operating system and HANA installation steps for SITE1 of the scale-out cluster, with the following exceptions:
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Cluster detects the replication status of connected sites and the monitored attributed can change between SOK and SFAIL. No cluster action if the replication to DR site fails.
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</details>
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## Auto-registering third site
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During planned or unplanned takeover event between the two Pacemaker cluster sites, HSR to third site will be also interrupted. Pacemaker doesn't modify HANA replication to third site.
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For HSR [multi-tier](https://help.sap.com/docs/SAP_HANA_PLATFORM/6b94445c94ae495c83a19646e7c3fd56/f730f308fede4040bcb5ccea6751e74d.html), no automatic SAP HANA registration of the third site exists. You need to manually register the third site to the current secondary, to keep HSR replication chain for multi-tier.
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![Diagram flow how HANA auto-registartion works with a third site during a takeover.](./media/sap-hana-high-availability/sap-hana-high-availability-hsr-third-site-auto-register.png)
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![Diagram flow showing how a HANA auto-registartion works with a third site during a takeover.](./media/sap-hana-high-availability/sap-hana-high-availability-hsr-third-site-auto-register.png)
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## Next steps
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