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Moved articles\virtual-machines\virtual-machines-windows-manage-availability.md to articles\virtual-machines\windows\manage-availability.md
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‎articles/active-directory/active-directory-install-replica-active-directory-domain-controller.md

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## Scenario diagram
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In this scenario, external users need to access applications that run on domain-joined servers. The VMs that run the application servers and the replica DCs are installed in an Azure virtual network. The virtual network can be connected to the on-premises network by a [site-to-site VPN](../vpn-gateway/vpn-gateway-site-to-site-create.md) connection, as shown in the following diagram, or you can use [ExpressRoute](../expressroute/expressroute-locations-providers.md) for a faster connection.
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The application servers and the DCs are deployed within separate cloud services to distribute compute processing and within [availability sets](../virtual-machines/virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) for improved fault tolerance.
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The application servers and the DCs are deployed within separate cloud services to distribute compute processing and within [availability sets](../virtual-machines/windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) for improved fault tolerance.
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The DCs replicate with each other and with on-premises DCs by using Active Directory replication. No synchronization tools are needed.
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![Diagram pf replica Active Directory domain controller an Azure vnet][1]

‎articles/azure-glossary-cloud-terminology.md

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### <a name="availability-set"></a>availability set
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A collection of virtual machines that are managed together to provide application redundancy and reliability. The use of an availability set ensures that during either a planned or unplanned maintenance event at least one virtual machine is available.
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See also [Manage the availability of Windows virtual machines](virtual-machines/virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) or [Manage the availability of Linux virtual machines](virtual-machines/virtual-machines-linux-manage-availability.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json)
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See also [Manage the availability of Windows virtual machines](virtual-machines/windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) or [Manage the availability of Linux virtual machines](virtual-machines/virtual-machines-linux-manage-availability.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json)
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### <a name="classic-model"></a>Azure classic deployment model
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One of two [deployment models](resource-manager-deployment-model.md) used to deploy resources in Azure (the new model is Azure Resource Manager). Some Azure resources can be deployed in one model or the other, while others can be deployed in both models. Guidance for individual Azure resources detail which model(s) a resource can be deployed with.
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### <a name="fault-domain"></a>fault domain
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The collection of virtual machines in an availability set that can possibly fail at the same time. An example is a group of machines in a rack that share a common power source and network switch. In Azure, the virtual machines in an availability set are automatically separated across multiple fault domains.
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See also [Manage the availability of Windows virtual machines](virtual-machines/virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) or [Manage the availability of Linux virtual machines](virtual-machines/virtual-machines-linux-manage-availability.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json)
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See also [Manage the availability of Windows virtual machines](virtual-machines/windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) or [Manage the availability of Linux virtual machines](virtual-machines/virtual-machines-linux-manage-availability.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json)
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### <a name="geo"></a>geo
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A defined boundary for data residency that typically contains two or more regions. The boundaries may be within or beyond national borders and are influenced by tax regulation. Every geo has at least one region. Examples of geos are Asia Pacific and Japan. Also called *geography*.
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### <a name="update-domain"></a>update domain
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The collection of virtual machines in an availability set that are updated at the same time. Virtual machines in the same update domain are restarted together during planned maintenance. Azure never restarts more than one update domain at a time. Also referred to as an upgrade domain.
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See also [Manage the availability of Windows virtual machines](virtual-machines/virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) or [Manage the availability of Linux virtual machines](virtual-machines/virtual-machines-linux-manage-availability.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json)
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See also [Manage the availability of Windows virtual machines](virtual-machines/windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) or [Manage the availability of Linux virtual machines](virtual-machines/virtual-machines-linux-manage-availability.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json)
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### <a name="vm"></a>virtual machine
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The software implementation of a physical computer that runs an operating system. Multiple virtual machines can run simultaneously on the same hardware. In Azure, virtual machines are available in a variety of sizes.

‎articles/storage/storage-about-disks-and-vhds-windows.md

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Every virtual machine has one attached operating system disk. It’s registered as a SATA drive and labeled as the C: drive by default. This disk has a maximum capacity of 1023 gigabytes (GB).
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### Temporary disk
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Each VM contains a temporary disk. The temporary disk provides short-term storage for applications and processes and is intended to only store data such as page or swap files. Data on the temporary disk may be lost during a [maintenance event](../virtual-machines/virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json#understand-planned-vs-unplanned-maintenance) or when you [redeploy a VM](../virtual-machines/virtual-machines-windows-redeploy-to-new-node.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json). During a standard reboot of the VM, the data on the temporary drive should persist.
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Each VM contains a temporary disk. The temporary disk provides short-term storage for applications and processes and is intended to only store data such as page or swap files. Data on the temporary disk may be lost during a [maintenance event](../virtual-machines/windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json#understand-planned-vs-unplanned-maintenance) or when you [redeploy a VM](../virtual-machines/virtual-machines-windows-redeploy-to-new-node.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json). During a standard reboot of the VM, the data on the temporary drive should persist.
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The temporary disk is labeled as the D: drive by default and it used for storing pagefile.sys. To remap this disk to a different drive letter, see [Change the drive letter of the Windows temporary disk](../virtual-machines/windows/change-drive-letter.md). The size of the temporary disk varies, based on the size of the virtual machine. For more information, see [Sizes for Windows virtual machines](../virtual-machines/virtual-machines-windows-sizes.md).
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‎articles/storage/storage-migrate-to-premium-storage-using-azure-site-recovery.md

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When you design your Azure Storage environment, we recommend that you use separate storage accounts for each VM in an availability set. We recommend that you follow the best practice in the storage layer for [Windows](../virtual-machines/virtual-machines-windows-manage-availability.md#use-multiple-storage-accounts-for-each-availability-set) and [Linux](../virtual-machines/virtual-machines-linux-manage-availability.md#use-multiple-storage-accounts-for-each-availability-set) VMs. Distributing VM disks to multiple storage accounts helps to improve storage availability and distributes the I/O across the Azure storage infrastructure. If your VMs are in an availability set, instead of replicating disks of all VMs into one storage account, we highly recommend migrating multiple VMs multiple times, so that the VMs in the same availability set do not share a single storage account. Use the **Enable Replication** blade to set up a destination storage account for each VM, one at a time.
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When you design your Azure Storage environment, we recommend that you use separate storage accounts for each VM in an availability set. We recommend that you follow the best practice in the storage layer for [Windows](../virtual-machines/windows/manage-availability.md#use-multiple-storage-accounts-for-each-availability-set) and [Linux](../virtual-machines/virtual-machines-linux-manage-availability.md#use-multiple-storage-accounts-for-each-availability-set) VMs. Distributing VM disks to multiple storage accounts helps to improve storage availability and distributes the I/O across the Azure storage infrastructure. If your VMs are in an availability set, instead of replicating disks of all VMs into one storage account, we highly recommend migrating multiple VMs multiple times, so that the VMs in the same availability set do not share a single storage account. Use the **Enable Replication** blade to set up a destination storage account for each VM, one at a time.
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You can choose a post-failover deployment model according to your need. If you choose Resource Manager (RM) as your post-failover deployment model, you can fail over a RM VM to an RM VM, or you can fail over a classic VM to an RM VM.
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8. **Run a test failover**. To check whether your replication is complete, click your Site Recovery and then click **Settings** > **Replicated Items**. You will see the status and percentage of your replication process. After initial replication is complete, run Test Failover to validate your replication strategy. For detailed steps of test failover, please refer to [Run a test failover in Site Recovery](../site-recovery/site-recovery-vmware-to-azure.md#run-a-test-failover). You can see the status of test failover in **Settings** > **Jobs** > **YOUR_FAILOVER_PLAN_NAME**. On the blade, you will see a breakdown of the steps and success/failure results. If the test failover fails at any step, click the step to check the error message. Make sure your VMs and replication strategy meet the requirements before you run a failover. Read [Test Failover to Azure in Site Recovery](../site-recovery/site-recovery-test-failover-to-azure.md) for more information and instructions of test failover.

‎articles/virtual-machines/virtual-machines-linux-manage-availability.md

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# Manage the availability of Linux virtual machines
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Learn ways to set up and manage multiple virtual machines to ensure high availability for your Linux application in Azure. You can also [manage the availability of Windows virtual machines](virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json).
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Learn ways to set up and manage multiple virtual machines to ensure high availability for your Linux application in Azure. You can also [manage the availability of Windows virtual machines](windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json).
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[!INCLUDE [learn-about-deployment-models](../../includes/learn-about-deployment-models-both-include.md)]
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---
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title: Manage the availability of Windows VMs in Azure | Microsoft Docs
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description: Learn how to use multiple virtual machines to ensure high availability for your Windows application in Azure
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services: virtual-machines-windows
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documentationcenter: ''
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author: cynthn
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manager: timlt
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editor: tysonn
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tags: azure-resource-manager,azure-service-management
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ms.assetid: 02351953-7b6a-4657-b9e1-de2ea8f6aa05
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ms.service: virtual-machines-windows
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ms.workload: infrastructure-services
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ms.tgt_pltfrm: vm-windows
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ms.devlang: na
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ms.topic: article
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ms.date: 03/21/2017
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ms.author: cynthn
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ms.custom: H1Hack27Feb2017
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---
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# Manage the availability of Windows virtual machines in Azure
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Learn ways to set up and manage multiple virtual machines to ensure high availability for your Windows application in Azure. You can also [manage the availability of Linux virtual machines](virtual-machines-linux-manage-availability.md?toc=%2fazure%2fvirtual-machines%2flinux%2ftoc.json).
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[!INCLUDE [learn-about-deployment-models](../../includes/learn-about-deployment-models-both-include.md)]
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For instructions on creating and using availability sets when using the classic deployment model, see [How to Configure an Availability Set](windows/classic/configure-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2fclassic%2ftoc.json).
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[!INCLUDE [virtual-machines-common-manage-availability](../../includes/virtual-machines-common-manage-availability.md)]
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## Next steps
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To learn more about load balancing your virtual machines, see [Load Balancing virtual machines](windows/load-balance.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json).
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---
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redirect_url: /azure/virtual-machines/windows/manage-availability
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redirect_document_id: true
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---

‎articles/virtual-machines/virtual-machines-windows-overview.md

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You use the Connect button in the Azure portal to [start a Remote Desktop (RDP) session](windows/connect-logon.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json). Things can sometimes go wrong when trying to use a remote connection. If this situation happens to you, check out the help information in [Troubleshoot Remote Desktop connections to an Azure virtual machine running Windows](virtual-machines-windows-troubleshoot-rdp-connection.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json).
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### Manage availability
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It’s important for you to understand how to [ensure high availability](virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) for your application. This configuration involves creating multiple VMs to ensure that at least one is running.
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It’s important for you to understand how to [ensure high availability](windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json) for your application. This configuration involves creating multiple VMs to ensure that at least one is running.
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In order for your deployment to qualify for our 99.95 VM Service Level Agreement, you need to deploy two or more VMs running your workload inside an [availability set](windows/infrastructure-availability-sets-guidelines.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json). This configuration ensures your VMs are distributed across multiple fault domains and are deployed onto hosts with different maintenance windows. The full [Azure SLA](https://azure.microsoft.com/support/legal/sla/virtual-machines/v1_0/) explains the guaranteed availability of Azure as a whole.
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‎articles/virtual-machines/virtual-machines-windows-planned-maintenance.md

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However, some updates do require a reboot to your virtual machines to apply the required updates to the infrastructure. The virtual machines are shut down while we patch the infrastructure, and then the virtual machines are restarted.
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Note that two types of maintenance can impact the availability of your virtual machines: planned and unplanned. This page describes how Microsoft Azure performs planned maintenance. For more information about unplanned maintenance, see [Understand planned versus unplanned maintenance](virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json).
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Note that two types of maintenance can impact the availability of your virtual machines: planned and unplanned. This page describes how Microsoft Azure performs planned maintenance. For more information about unplanned maintenance, see [Understand planned versus unplanned maintenance](windows/manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json).
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[!INCLUDE [virtual-machines-common-planned-maintenance](../../includes/virtual-machines-common-planned-maintenance.md)]

‎articles/virtual-machines/windows/TOC.md

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### [Create an FDQN using the portal](../virtual-machines-windows-portal-create-fqdn.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json)
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## Scale and availability
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### [VM availability](../virtual-machines-windows-manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json)
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### [VM availability](manage-availability.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json)
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### [Create an availability set](create-availability-set.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json)
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### [Change availability set for VM](change-availability-set.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json)
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### [Load Balancer overview](load-balance.md?toc=%2fazure%2fvirtual-machines%2fwindows%2ftoc.json)

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