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Copy file name to clipboardExpand all lines: articles/virtual-machines/workloads/sap/planning-guide.md
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## Azure virtual machine services
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Azure offers a large variety of virtual machines that you can select to deploy. There is no need for up-front technology and infrastructure purchases. The azure VM service offering simplifies maintaining and operating applications by providing on-demand compute and storage to host, scale, and manage web application and connected applications. Infrastructure management is automated with a platform that is designed for high availability and dynamic scaling to match usage needs with the option of several different pricing models.
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Azure offers a large variety of virtual machines that you can select to deploy. There is no need for up-front technology and infrastructure purchases. The Azure VM service offering simplifies maintaining and operating applications by providing on-demand compute and storage to host, scale, and manage web application and connected applications. Infrastructure management is automated with a platform that is designed for high availability and dynamic scaling to match usage needs with the option of several different pricing models.
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![Positioning of Microsoft Azure Virtual Machine Services][planning-guide-figure-400]
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Another topic, which is relevant for Storage Accounts is whether the VHDs in a Storage Account are getting Geo-replicated. Geo-replication is enabled or disabled on the Storage Account level and not on the VM level. If geo-replication is enabled, the VHDs within the Storage Account would be replicated into another Azure data center within the same region. Before deciding on this, you should think about the following restriction:
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Azure Geo-replication works locally on each VHD in a VM and does not replicate the IOs in chronological order across multiple VHDs in a VM. Therefore, the VHD that represents the base VM as well as any additional VHDs attached to the VM are replicated independent of each other. This means there is no synchronization between the changes in the different VHDs. The fact that the IOs are replicated independently of the order in which they are written means that geo-replication is not of value for database servers that have their databases distributed over multiple VHDs. In addition to the DBMS, there also might be other applications where processes write or manipulate data in different VHDs and where it is important to keep the order of changes. If that is a requirement, geo-replication in Azure should not be enabled. Dependent on whether you need or want geo-replication for a set of VMs, but not for another set, you can already categorize VMs and their related VHDs into different Storage Accounts that have geo-replication enabled or disabled.
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Azure Geo-replication works locally on each VHD in a VM and does not replicate the I/Os in chronological order across multiple VHDs in a VM. Therefore, the VHD that represents the base VM as well as any additional VHDs attached to the VM are replicated independent of each other. This means there is no synchronization between the changes in the different VHDs. The fact that the I/Os are replicated independently of the order in which they are written means that geo-replication is not of value for database servers that have their databases distributed over multiple VHDs. In addition to the DBMS, there also might be other applications where processes write or manipulate data in different VHDs and where it is important to keep the order of changes. If that is a requirement, geo-replication in Azure should not be enabled. Dependent on whether you need or want geo-replication for a set of VMs, but not for another set, you can already categorize VMs and their related VHDs into different Storage Accounts that have geo-replication enabled or disabled.
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#### <aname="17e0d543-7e8c-4160-a7da-dd7117a1ad9d"></a>Setting automount for attached disks
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Dependent on the SAP configuration chosen (2-Tier or 3-Tier) there could be a need to back up. The content of the VM itself plus to have a backup of the database. The DBMS-related backups are expected to be done with database methods. A detailed description for the different databases, can be found in [DBMS Guide][dbms-guide]. On the other hand, the SAP data can be backed up in an offline manner (including the database content as well) as described in this section or online as described in the next section.
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The offline backup would basically require a shutdown of the VM through the Azure portal and a copy of the base VM disk plus all attached disks to the VM. This would preserve a point in time image of the VM and its associated disk. It is recommended to copy the backups into a different Azure Storage Account. Hence the procedure described in chapter [Copying disks between Azure Storage Accounts][planning-guide-5.4.2] of this document would apply.
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Besides the shutdown using the Azure portal one can also do it via Powershell or CLI as described here:
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Besides the shutdown using the Azure portal one can also do it via PowerShell or CLI as described here:
A restore of that state would consist of deleting the base VM as well as the original disks of the base VM and mounted disks, copying back the saved disks to the original Storage Account or resource group for managed disks and then redeploying the system.
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