{"id":15151,"date":"2020-08-05T07:47:05","date_gmt":"2020-08-05T07:47:05","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=15151"},"modified":"2020-08-27T08:14:44","modified_gmt":"2020-08-27T08:14:44","slug":"on-premises-disaster-recovery-failover-and-failback","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/on-premises-disaster-recovery-failover-and-failback\/","title":{"rendered":"On-premises disaster recovery failover and failback"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.testpreptraining.ai\/tutorial\/exam-az-304-microsoft-azure-architect-design\/\" target=\"_blank\" rel=\"noreferrer noopener\">Go back to AZ-304 Tutorials<\/a><\/p>\n\n\n\n<p>In this tutorial, we will understand and learn about failover and failback during disaster recovery of on-premises machines to Azure with Azure Site Recovery. Moreover, we will cover the process of running a disaster recovery drill to Azure, using a Site Recovery test failover.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Recovery stages<\/strong><\/h3>\n\n\n\n<p>Failover and failback in Site Recovery has four stages:<\/p>\n\n\n\n<p><strong>Stage 1:<\/strong><\/p>\n\n\n\n<p>Failover from on-premises in which after setting up replication to Azure for on-premises machines, when your on-premises site goes down, you fail those machines over to Azure.&nbsp;<\/p>\n\n\n\n<p><strong>Stage 2:&nbsp;<\/strong><\/p>\n\n\n\n<p>Reprotecting Azure VM so that they start replicating back to the on-premises site. The on-premises VM is set off during reprotection, to help ensure data consistency.<\/p>\n\n\n\n<p><strong>Stage 3:<\/strong><\/p>\n\n\n\n<p>Failover from Azure, this specifies when the on-premises site is running as normal again then you run another fail over. However, this time to failback Azure VMs to your on-premises site. You can failback to the original location from which you failed over, or to an alternate location.<\/p>\n\n\n\n<p><strong>Stage 4:&nbsp;<\/strong><\/p>\n\n\n\n<p>Reprotecting on-premises machines after failing back, again enables replication of the on-premises machines to Azure.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Failover<\/strong><\/h4>\n\n\n\n<p>Performing a failover is part of your business continuity and disaster recovery (BCDR) strategy.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Firstly, in BCDR strategy, replicate your on-premises machines to Azure on an ongoing basis. However, users access workloads and apps running on the on-premises source machines.<\/li><li>Secondly, if the need arises, like there&#8217;s an outage on-premises and you fail the replicating machines over to Azure. Azure VMs are created using the replicated data.<\/li><li>Lastly, for business continuity, users can continue accessing apps on the Azure VMs.<\/li><\/ul>\n\n\n\n<h6 class=\"wp-block-heading\"><strong>Failover is a two-phase activity:<\/strong><\/h6>\n\n\n\n<ul class=\"wp-block-list\"><li>Firstly, <strong>Failover<\/strong> that creates and brings up an Azure VM using the selected recovery point.<\/li><li>Secondly, <strong>Commit<\/strong>, in this after failover you verify the VM in Azure and then you can then commit the failover to the selected recovery point, or select a different point for the commit.<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.testpreptraining.ai\/microsoft-azure-architect-design-az-304-free-practice-test\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" width=\"961\" height=\"150\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/AZ-304-practice-tests-6.png\" alt=\"AZ-304 practice tests\" class=\"wp-image-18234\" srcset=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/AZ-304-practice-tests-6.png 961w, https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/AZ-304-practice-tests-6-750x117.png 750w\" sizes=\"auto, (max-width: 961px) 100vw, 961px\" \/><\/a><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Connecting Azure after Failover<\/strong><\/h3>\n\n\n\n<p>For connecting to the Azure VMs created after failover using RDP\/SSH, there are a number of requirements.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover.png\" alt=\"connecting failover\" class=\"wp-image-15154\" width=\"870\" height=\"685\" srcset=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover.png 978w, https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover-508x400.png 508w\" sizes=\"auto, (max-width: 870px) 100vw, 870px\" \/><figcaption>Image Source: Microsoft<\/figcaption><\/figure><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Types of Failover<\/strong><\/h4>\n\n\n\n<p>Site Recovery provides different failover options.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover-1.png\" alt=\"failover types\" class=\"wp-image-15155\" width=\"769\" height=\"721\" srcset=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover-1.png 909w, https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover-1-427x400.png 427w\" sizes=\"auto, (max-width: 769px) 100vw, 769px\" \/><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover-2.png\" alt=\"failover types\" class=\"wp-image-15157\" width=\"774\" height=\"632\" srcset=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover-2.png 921w, https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/failover-2-490x400.png 490w\" sizes=\"auto, (max-width: 774px) 100vw, 774px\" \/><figcaption>Image Source: Microsoft<\/figcaption><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Reprotection\/failback<\/strong><\/h3>\n\n\n\n<p>After failing over to Azure, the replicated Azure VMs are in an unprotected state.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Firstly, as failing back to your on-premises site, you need to start the Azure VMs replicating to on-premises. Then, the reproduction process depends on the type of machines you failed over.<\/li><li>However, after machines are replicating from Azure to on-premises, you can run a failover from Azure to your on-premises site.<\/li><li>Then, after machines are running on-premises again, enable the replication so that they replicate to Azure for disaster recovery.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Working of Failback<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>For failing back, a VM needs at least one recovery point in order to fail back. However, in a recovery plan, all VMs in the plan need at least one recovery point.<\/li><li>However, there is an app-consistent recovery point option. In this, a single VM recovers to its latest available app-consistent recovery point. And, for a recovery plan with a replication group, each replication group recovers to its common available recovery point.<\/li><li>Thirdly, during failover from Azure to the on-premises site, Site Recovery shuts down the Azure VMs. And, then you commit the failover, Site Recovery removes the failed back Azure VMs in Azure.<\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Hyper-V reprotection\/failback<\/strong><\/h4>\n\n\n\n<p>For reprotecting and failing back Hyper-V VMs from Azure to on-premises:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Firstly, you can only fail back Hyper-V VMs replicating using a storage account. However, Failback of Hyper-V VMs that replicate using managed disks is not supported.<\/li><li>Secondly, On-premises Hyper-V hosts should be connected to Azure.<\/li><li>Thirdly, you run a planned failback from Azure to on-premises. Moreover, there are no specific components necessary to be set up for Hyper-V VM failback.<\/li><li>However, during planned failover, you can select options for synchronizing data before failback:<\/li><\/ul>\n\n\n\n<p><strong>Synchronizing data before failover:<\/strong> This minimizes downtime for virtual machines as it synchronizes machines without shutting them down.<\/p>\n\n\n\n<p><strong>Phase 1:<\/strong> This takes a snapshot of the Azure VM and copies it to the on-premises Hyper-V host.<\/p>\n\n\n\n<p><strong>Phase 2:<\/strong> This shuts down the Azure VM so that no new changes occur there. However, the final set of delta changes is transferred to the on-premises server and the on-premises VM is started up.<\/p>\n\n\n\n<p><strong>Synchronizing data during failover only:<\/strong> This option is faster as we expect that most of the disk has changed, and thus don&#8217;t perform checksum calculations. It performs a download of the disk.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Running a test failover to Azure<\/strong><\/h4>\n\n\n\n<p>Running a test failover can help in validating your replication and disaster recovery strategy, without any data loss or downtime. However, a test failover doesn&#8217;t impact ongoing replication, or your production environment. So, you can run a test failover on a specific virtual machine (VM), or on a recovery plan containing multiple VMs.<\/p>\n\n\n\n<p>However, if you want to run a test failover for a single VM, follow the steps below:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Firstly, in Site Recovery in the Azure portal, click Recovery Plans &gt; recoveryplan_name &gt; Test Failover.<\/li><li>Secondly, select a Recovery Point to which to failover.&nbsp;<\/li><\/ul>\n\n\n\n<h6 class=\"wp-block-heading\"><em>For this, you can use one of the following options:<\/em><\/h6>\n\n\n\n<p>Firstly, <strong>Latest processed<\/strong>, this fails over all VMs in the plan to the latest recovery point processed by Site Recovery.&nbsp;<\/p>\n\n\n\n<p>Secondly, <strong>Latest app-consistent, <\/strong>this fails over all the VMs in the plan to the latest application-consistent recovery point processed by Site Recovery.&nbsp;<\/p>\n\n\n\n<p>Then, th<strong>e Latest option,<\/strong> this first processes all the data sent to the Site Recovery service for creating a recovery point for each VM before failing over to it. Moreover, this option provides the lowest RPO (Recovery Point Objective).<\/p>\n\n\n\n<p>Then, <strong>Latest multi-VM processes<\/strong>, this option is available for recovery plans with one or more VMs that have multi-VM consistency enabled.&nbsp;<\/p>\n\n\n\n<p>After that, <strong>Latest multi-VM app-consistent<\/strong>, this option is available for recovery plans with one or more VMs that have multi-VM consistency enabled.&nbsp;<\/p>\n\n\n\n<p>Lastly, <strong>Custom<\/strong>,&nbsp; use this option to fail over a specific VM to a particular recovery point.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Thirdly, select an Azure virtual network in which test VMs will be created.<\/li><li>However, if you are failing over to Azure and data encryption is on. Then, in Encryption Key, select the certificate that was issued when you enabled encryption during Provider installation.&nbsp;<\/li><li>After that, track failover progress on the Jobs tab. Then, you should be able to see the test replica machine in the Azure portal.<\/li><li>Then, for initiating an RDP connection to the Azure VM, you need to add a public IP address on the network interface of the failed VM.<\/li><li>After that, click Cleanup test failover. Further, this deletes the VMs that were created during test failover.<\/li><li>Lastly, in Notes, record and save any observations associated with the test failover.<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.testpreptraining.ai\/microsoft-azure-architect-design-az-304-practice-exam\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" width=\"961\" height=\"150\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/Az-304-online-course-11.png\" alt=\"AZ-304 online course\" class=\"wp-image-15152\" srcset=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/Az-304-online-course-11.png 961w, https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2020\/08\/Az-304-online-course-11-750x117.png 750w\" sizes=\"auto, (max-width: 961px) 100vw, 961px\" \/><\/a><\/figure><\/div>\n\n\n\n<p class=\"has-text-align-right\"><strong>Reference: <\/strong><a rel=\"noreferrer noopener\" href=\"https:\/\/docs.microsoft.com\/en-us\/azure\/site-recovery\/failover-failback-overview\" target=\"_blank\">Microsoft Documentation<\/a>, <a href=\"https:\/\/docs.microsoft.com\/en-us\/azure\/site-recovery\/site-recovery-test-failover-to-azure\" target=\"_blank\" rel=\"noreferrer noopener\">Documentation 2<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.testpreptraining.ai\/tutorial\/exam-az-304-microsoft-azure-architect-design\/\" target=\"_blank\" rel=\"noreferrer noopener\"><a href=\"https:\/\/www.testpreptraining.ai\/tutorial\/exam-az-304-microsoft-azure-architect-design\/\" target=\"_blank\" rel=\"noreferrer noopener\">Go back to AZ-304 Tutorials<\/a><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Go back to AZ-304 Tutorials In this tutorial, we will understand and learn about failover and failback during disaster recovery of on-premises machines to Azure with Azure Site Recovery. Moreover, we will cover the process of running a disaster recovery drill to Azure, using a Site Recovery test failover. Recovery stages Failover and failback in&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-15151","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>On-premises disaster recovery failover and failback | Microsoft AZ-304<\/title>\n<meta name=\"description\" content=\"Increase your knowledge level by learning about disaster recovery failover and failback using Microsoft Azure AZ-304 online course and practice exam Now!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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