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Merge pull request #232350 from ankitaduttaMSFT/ad-hoc-changes
new FAQ question
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articles/site-recovery/site-recovery-sql.md

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@@ -6,7 +6,7 @@ author: ankitaduttaMSFT
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manager: rochakm
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ms.service: site-recovery
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ms.topic: conceptual
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ms.date: 08/02/2019
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ms.date: 03/28/2023
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ms.author: ankitadutta
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Set up Active Directory in the secondary recovery site for SQL Server to run properly.
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* **Small enterprise**: You have a small number of applications and a single domain controller for the on-premises site. If you want to fail over the entire site, use Site Recovery replication. This service replicates the domain controller to the secondary datacenter or to Azure.
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* **Small enterprise**: You have a few applications and a single domain controller for the on-premises site. If you want to fail over the entire site, use Site Recovery replication. This service replicates the domain controller to the secondary datacenter or to Azure.
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* **Medium to large enterprise**: You might need to set up additional domain controllers.
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- If you have a large number of applications, have an Active Directory forest, and want to fail over by application or workload, set up another domain controller in the secondary datacenter or in Azure.
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- If you're using Always On availability groups to recover to a remote site, set up another domain controller on the secondary site or in Azure. This domain controller is used for the recovered SQL Server instance.
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Site Recovery doesn't provide guest cluster support when replicating to an Azure region. SQL Server Standard edition also doesn't provide a low-cost disaster recovery solution. In this scenario, we recommend you protect the SQL Server cluster to a standalone SQL Server instance in the primary location and recover it in the secondary.
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1. Configure an additional standalone SQL Server instance on the primary Azure region or at on-premises site.
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1. Configure another standalone SQL Server instance on the primary Azure region or at on-premises site.
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1. Configure the instance to serve as a mirror for the databases you want to help protect. Configure mirroring in high-safety mode.
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1. Configure Site Recovery on the primary site for [Azure](azure-to-azure-tutorial-enable-replication.md), [Hyper-V](./hyper-v-azure-tutorial.md), or [VMware VMs and physical servers](./vmware-azure-tutorial.md).
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1. Use Site Recovery replication to replicate the new SQL Server instance to the secondary site. As it's a high-safety mirror copy, it will be synchronized with the primary cluster but replicated using Site Recovery replication.
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1. Use Site Recovery replication to replicate the new SQL Server instance to the secondary site. As it's a high-safety mirror copy, it is synchronized with the primary cluster but replicated using Site Recovery replication.
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![Image of a standard cluster that shows the relationship and flow among a primary site, Site Recovery, and Azure](./media/site-recovery-sql/standalone-cluster-local.png)
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Site Recovery is application agnostic. Site Recovery can help protect any version of SQL Server that is deployed on a supported operating system. For more, see the [support matrix for recovery](vmware-physical-azure-support-matrix.md#replicated-machines) of replicated machines.
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### Does ASR Work with SQL Transasctional Replication?
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Due to ASR using file-level copy, SQL cannot guarantee the servers in an associated SQL Replication topology are in sync at the time of ASR failover. This may cause the logreader and/or distribution agents to fail due to LSN mismatch which causes replication to break. Should you failover the publisher, distributor, or subscriber in a replication topology, you will need to rebuild replication.
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### Does ASR Work with SQL Transactional Replication?
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Due to ASR using file-level copy, SQL cannot guarantee that the servers in an associated SQL replication topology are in sync at the time of ASR failover. This may cause the logreader and/or distribution agents to fail due to LSN mismatch, which can break replication. If you failover the publisher, distributor, or subscriber in a replication topology, you need to rebuild replication. It is recommended to [reinitialize the subscription to SQL Server](https://learn.microsoft.com/sql/relational-databases/replication/reinitialize-a-subscription?view=sql-server-ver16).
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## Next steps
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* Learn more about [Site Recovery architecture](./azure-to-azure-architecture.md).
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* For SQL Server in Azure, learn more about [high availability solutions](/azure/azure-sql/virtual-machines/windows/business-continuity-high-availability-disaster-recovery-hadr-overview#azure-only-high-availability-solutions) for recovery in a secondary Azure region.
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* For SQL Database, learn more about the [business continuity](/azure/azure-sql/database/business-continuity-high-availability-disaster-recover-hadr-overview) and [high availability](/azure/azure-sql/database/high-availability-sla) options for recovery in a secondary Azure region.
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* For SQL Server machines at on-premises, learn more about the [high availability options](/azure/azure-sql/virtual-machines/windows/business-continuity-high-availability-disaster-recovery-hadr-overview#hybrid-it-disaster-recovery-solutions) for recovery in Azure Virtual Machines.
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- Learn more about [Site Recovery architecture](./azure-to-azure-architecture.md).
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- For SQL Server in Azure, learn more about [high availability solutions](/azure/azure-sql/virtual-machines/windows/business-continuity-high-availability-disaster-recovery-hadr-overview#azure-only-high-availability-solutions) for recovery in a secondary Azure region.
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- For SQL Database, learn more about the [business continuity](/azure/azure-sql/database/business-continuity-high-availability-disaster-recover-hadr-overview) and [high availability](/azure/azure-sql/database/high-availability-sla) options for recovery in a secondary Azure region.
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- For SQL Server machines at on-premises, learn more about the [high availability options](/azure/azure-sql/virtual-machines/windows/business-continuity-high-availability-disaster-recovery-hadr-overview#hybrid-it-disaster-recovery-solutions) for recovery in Azure Virtual Machines.

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