{"id":7755,"date":"2016-07-05T09:00:43","date_gmt":"2016-07-05T16:00:43","guid":{"rendered":"https:\/\/blogs.technet.microsoft.com\/windowsserver\/?p=7755"},"modified":"2024-03-11T09:19:28","modified_gmt":"2024-03-11T16:19:28","slug":"whats-new-in-failover-clustering-05-resilient-private-cloud","status":"publish","type":"post","link":"https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/2016\/07\/05\/whats-new-in-failover-clustering-05-resilient-private-cloud\/","title":{"rendered":"What\u2019s new in failover clustering: #05 Resilient private cloud"},"content":{"rendered":"<p><em>This post was authored by Subhasish Bhattacharya, Program Manager, Windows Server.<\/em><\/p>\n<h2>Introduction<\/h2>\n<p>In the past, in a world of reliable but expensive SANs, an aggressive high-availability strategy designed to fail fast was most optimal. The health of the system would be closely monitored to detect issues and react quickly and swiftly. This minimized downtime when catastrophic failures occurred.<\/p>\n<p>In today\u2019s cloud-scale environments, commonly comprising of commodity hardware, transient failures have become more common than hard failures. These transient compute and storage failures in commodity hardware are triggered by common events such as switch reset, packet loss, latency, and spanning tree convergence. In this new world, reacting aggressively to handle transient failures can cause more downtime than it prevents.<\/p>\n<p>The storage and compute stack in Windows Server 2016 has been designed to optimize both high availability and resiliency. In a Software Defined Datacenter, we must assume infrastructure will break and it is imperative that software is resilient. At the same time, it is not acceptable to have degraded Virtual Machine (VM) availability.<\/p>\n<h2>Resilient private clouds: Compute and storage virtual machine resiliency<\/h2>\n<p>Windows Server 2016 introduces increased VM resiliency features to address both:<\/p>\n<ul>\n<li>Compute failures: Due to <strong>east-west<\/strong> transient <strong>network<\/strong> failures.<\/li>\n<li>Storage failures: Due to <strong>north-south<\/strong> transient <strong>storage<\/strong> failures.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"385\" title=\"\" style=\"border: 0px currentcolor\" alt=\"\" src=\"https:\/\/cloudblogs.microsoft.com\/wp-content\/uploads\/2016\/07\/WS05_1.png\" border=\"0\"><\/p>\n<h4>Compute resiliency<\/h4>\n<p>Transient network failures impede intra-cluster communication for your private cloud. This results in cluster nodes being removed from active membership in a cluster. In Windows Server 2016, your cluster is resilient to intra-cluster communication failures. This resiliency is achieved by the following:<\/p>\n<ul>\n<li>A VM continues to run on a node even when it falls out of cluster membership. In this state, the node is considered to be in an \u201cisolated\u201d state and the VM is \u201cunmonitored\u201d &#8211; i.e., its health is not being actively monitored by the cluster service.<\/li>\n<li>If the network connectivity of the \u201cisolated\u201d node fails to recover within a certain duration, the VM is live-migrated to another node in the cluster. Note that this results in no downtime for the VM.<\/li>\n<li>Additionally, \u201cflapping\u201d nodes, which constantly come in and out of cluster membership, are temporarily banished and placed in a \u201cquarantined\u201d state.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"629\" height=\"478\" title=\"\" style=\"border: 0px currentcolor\" alt=\"\" src=\"https:\/\/cloudblogs.microsoft.com\/wp-content\/uploads\/2016\/07\/WS05_2.png\" border=\"0\"><\/p>\n<h4>Storage resiliency<\/h4>\n<p>A transient storage failure results in a VM being unable to access its underlying VHDX file since read or write requests to disk fail. In Windows Server 2016, a VM is able to seamlessly detect and be resilient to such transient failures as follows:<\/p>\n<ol>\n<li>On detecting a transient storage failure, the tenant VM session state is preserved.<\/li>\n<li>Any failure in block- or file-based storage infrastructure is handled by the VM stack, triggering an intelligent and quick response.<\/li>\n<li>The VM is moved to a \u201cPausedCritical\u201d state as it waits for the storage to recover.<\/li>\n<li>On recovery from the transient failure, the session state is restored.<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"291\" title=\"\" style=\"border: 0px currentcolor\" alt=\"\" src=\"https:\/\/cloudblogs.microsoft.com\/wp-content\/uploads\/2016\/07\/WS05_3.png\" border=\"0\"><\/p>\n<p>To try this new feature in Windows Server 2016, download the <a href=\"https:\/\/www.microsoft.com\/en-us\/evalcenter\/evaluate-windows-server-technical-preview\">Technical Preview<\/a>. For additional details, see the feature blog posts for <a href=\"https:\/\/blogs.msdn.microsoft.com\/clustering\/2015\/06\/03\/virtual-machine-compute-resiliency-in-windows-server-2016\/\">compute<\/a> and <a href=\"https:\/\/blogs.technet.microsoft.com\/virtualization\/2015\/09\/08\/virtual-machine-storage-resiliency-in-windows-server-2016\/\">storage<\/a> VM resiliency.<\/p>\n<p>Check out the series:<\/p>\n<p>&#8211;\u00a0\u00a0\u00a0 <a href=\"https:\/\/blogs.technet.microsoft.com\/windowsserver\/2016\/06\/02\/whats-new-in-failover-clustering-01-cluster-os-rolling-upgrade\/\">#01 Cluster OS Rolling Upgrade<\/a><br \/>\n&#8211;\u00a0\u00a0\u00a0 <a href=\"https:\/\/blogs.technet.microsoft.com\/windowsserver\/2016\/06\/09\/whats-new-in-failover-clustering-02-cluster-node-fairness\/\">#02 VM Load Balancing<\/a><br \/>\n&#8211;\u00a0\u00a0\u00a0 <a href=\"https:\/\/blogs.technet.microsoft.com\/windowsserver\/2016\/06\/17\/whats-new-in-failover-clustering-3-stretched-clusters\/\">#03 Stretched Clusters<\/a><br \/>\n&#8211;\u00a0\u00a0\u00a0 <a href=\"https:\/\/blogs.technet.microsoft.com\/windowsserver\/2016\/06\/20\/whats-new-in-failover-clustering-04-workgroup-and-multi-domain-clusters\/\">#04 Workgroup and multi-domain clusters<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post was authored by Subhasish Bhattacharya, Program Manager, Windows Server. Introduction In the past, in a world of reliable but expensive SANs, an aggressive high-availability strategy designed to fail fast was most optimal. The health of the system would be closely monitored to detect issues and react quickly and swiftly.<\/p>\n","protected":false},"author":685,"featured_media":20663,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"msxcm_post_with_no_image":false,"ep_exclude_from_search":false,"_classifai_error":"","_classifai_text_to_speech_error":"","footnotes":""},"post_tag":[842],"product":[991],"content-type":[964],"solution":[1015],"coauthors":[926],"class_list":["post-7755","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-failover-cluster","product-windows-server-2016","content-type-updates","solution-storage"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What\u2019s new in failover clustering: #05 Resilient private cloud | Microsoft Windows Server Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.microsoft.com\/en-us\/windows-server\/blog\/2016\/07\/05\/whats-new-in-failover-clustering-05-resilient-private-cloud\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What\u2019s new in failover clustering: #05 Resilient private cloud | Microsoft Windows Server Blog\" \/>\n<meta property=\"og:description\" content=\"This post was authored by Subhasish Bhattacharya, Program Manager, Windows Server. 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