---
title: "Best and Worst High Availability Use Cases: A SafeKit Implementation Guide"
description: "Best and Worst High Availability Use Cases: A SafeKit Implementation Guide"
canonical: "https://safekit.eviden.com/use-cases/best-worst-use-cases-high-availability/"
topics: "Best use cases of SafeKit high availability, Worst use cases of SafeKit high availability, SafeKit High Availability Limitations, 🔍 SafeKit High Availability Navigation Hub"
category: "use-cases"
lang: "en"
---

<h1 id="best-and-worst-high-availability-use-cases-a-safekit-implementation-guide">Best and Worst High Availability Use Cases: A SafeKit Implementation Guide</h1>
<h2 id="best-use-cases-of-safekit-high-availability">Best use cases of SafeKit high availability</h2>
<h3 id="oem-software">OEM Software</h3>
<p>A software publisher uses <a href="/use-cases/application-clustering-software/">SafeKit as an OEM software</a> for high availability of its application</p>
<img src="/wp-content/uploads/2023/02/application-clustering-software-3.png" width="300" alt="Application Clustering Software for a Software Publisher">
<h3 id="distributed-enterprise">Distributed Enterprise</h3>
<p>A distributed enterprise deploys <a href="/use-cases/business-continuity-software/">SafeKit in many branches</a> without specific IT skills</p>
<img src="/wp-content/uploads/2023/02/distributed-enterprise-1.png" width="300" alt="High Availability Software in a Distributed Enterprise">
<h3 id="remote-sites">Remote Sites</h3>
<p><a href="/best-practises/high-availability-disaster-recovery-hadr/">SafeKit is deployed in two remote sites</a> without the need for replicated bays of disks through a SAN.</p>
<img src="/wp-content/uploads/2023/02/remote-datacenters.png" width="300" alt="Business Continuity and Disaster Recovery without a replicated SAN">
<h2 id="worst-use-cases-of-safekit-high-availability">Worst use cases of SafeKit high availability</h2>
<h2 id="safekit-ha-limitations">SafeKit High Availability Limitations</h2>
<h3 id="why-a-replication-of-a-few-tera-bytes">Why a replication of a few Tera-bytes?</h3>
<p>Resynchronization time after a failure (<a href="/architectures/file-replication-byte-level-with-failover-mirror-cluster/#safekit-mirror-cluster">step 3</a>)</p>
<ul>
<li>1 Gb/s network ≈ 3 Hours for 1 Tera-bytes.</li>
<li>10 Gb/s network ≈ 1 Hour for 1 Tera-bytes or less depending on disk write performances.</li>
</ul>
<h4 id="alternative">Alternative</h4>
<ul>
<li>For a large volume of data, use <a href="/best-practises/san-vs-nas-shared-storage-for-a-failover-cluster/">external shared storage</a>.</li>
<li>More expensive, more complex.</li>
</ul>
<h3 id="why-a-replication-lt-1000000-files">Why a replication &lt; 1,000,000 files?</h3>
<ul>
<li>Resynchronization time performance after a failure (<a href="/architectures/file-replication-byte-level-with-failover-mirror-cluster/#safekit-mirror-cluster">step 3</a>).</li>
<li>Time to check each file between both nodes.</li>
</ul>
<h4 id="alternative-1">Alternative</h4>
<ul>
<li>Put the many files to replicate in a virtual hard disk / virtual machine.</li>
<li>Only the files representing the virtual hard disk / virtual machine will be replicated and resynchronized in this case.</li>
</ul>
<h3 id="why-a-failover--32-replicated-vms">Why a failover ≤ 32 replicated VMs?</h3>
<ul>
<li>Each VM runs in an independent mirror module.</li>
<li>Maximum of 32 mirror modules running on the same cluster.</li>
</ul>
<h4 id="alternative-2">Alternative</h4>
<ul>
<li>Use an external shared storage and another VM clustering solution.</li>
<li>More expensive, more complex.</li>
</ul>
<h3 id="why-a-lanvlan-network-between-remote-sites">Why a LAN/VLAN network between remote sites?</h3>
<ul>
<li>Automatic failover of the <a href="/best-practises/how-a-virtual-ip-address-works/">virtual IP address</a> with 2 nodes in the same subnet.</li>
<li>Good bandwidth for resynchronization (<a href="/architectures/file-replication-byte-level-with-failover-mirror-cluster/#safekit-mirror-cluster">step 3</a>) and good latency for <a href="/best-practises/synchronous-replication-vs-asynchronous-replication/">synchronous replication</a> (typically a round-trip of less than 2ms).</li>
</ul>
<h4 id="alternative-3">Alternative</h4>
<ul>
<li>Use a <a href="/best-practises/how-a-virtual-ip-address-works/">load balancer for the virtual IP address</a> if the 2 nodes are in 2 subnets (supported by SafeKit, especially in the cloud).</li>
<li>Use backup solutions with asynchronous replication for high latency network.</li>
</ul>
<h2 id="hub">🔍 SafeKit High Availability Navigation Hub</h2>
<p><strong>Explore SafeKit: Features, technical videos, documentation, and free trial</strong></p>
<table>
<thead>
<tr>
<th>Resource Type</th>
<th>Description</th>
<th>Direct Link</th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Key Features</strong></td>
<td>Why Choose SafeKit for Simple and Cost-Effective High Availability?</td>
<td><a href="/#why-choose-safekit-for-ha" title="Discover SafeKit features for simple and cost-effective high availability">See Why Choose SafeKit for High Availability</a></td>
</tr>
<tr>
<td><strong>Use Cases</strong></td>
<td>Explore How SafeKit Ensures the High Availability of Critical Infrastructure</td>
<td><a href="/#safekit-use-cases" title="Explore SafeKit high availability use cases">See All Use Cases (OEM Software, Edge Servers, SCADA, and more)</a></td>
</tr>
<tr>
<td><strong>Deployment Model</strong></td>
<td>All-in-One SANless HA: Shared-Nothing Software Clustering</td>
<td><a href="/#all-in-one-sanless-ha" title="Learn about all-in-one SANless high availability with shared-nothing software clustering">See SafeKit All-in-One SANless HA</a></td>
</tr>
<tr>
<td><strong>HA Strategies</strong></td>
<td>SafeKit: Infrastructure (VM) vs. Application-Level High Availability</td>
<td><a href="/#safekit-ha-redundancy-choices" title="Compare VM-level redundancy with SafeKit application-level high availability strategies">See SafeKit HA &amp; Redundancy: VM vs. Application Level</a></td>
</tr>
<tr>
<td><strong>Technical Specifications</strong></td>
<td>Technical Limitations for SafeKit Clustering</td>
<td><a href="/#safekit-ha-limitations" title="Technical requirements and limitations for SafeKit application clustering">See SafeKit High Availability Limitations</a></td>
</tr>
<tr>
<td><strong>Proof of Concept</strong></td>
<td>SafeKit: High Availability Configuration &amp; Failover Demos</td>
<td><a href="/#safekit-failover-tutorials" title="Step-by-step videos on SafeKit high availability, from installation to automated failover">See SafeKit Failover Tutorials</a></td>
</tr>
<tr>
<td><strong>Architecture</strong></td>
<td>How the SafeKit Mirror Cluster works (Real-Time Replication &amp; Failover)</td>
<td><a href="/#safekit-mirror-cluster" title="See technical architecture and failover mechanism of SafeKit Mirror Cluster">See SafeKit Mirror Cluster: Real-Time Replication &amp; Failover</a></td>
</tr>
<tr>
<td><strong>Architecture</strong></td>
<td>How the SafeKit Farm Cluster works (Network Load Balancing &amp; Failover)</td>
<td><a href="/#safekit-farm-cluster" title="Technical overview of SafeKit Farm Cluster architecture with network load balancing">See SafeKit Farm Cluster: Network Load Balancing &amp; Failover</a></td>
</tr>
<tr>
<td><strong>Competitive Advantages</strong></td>
<td>Comparison: SafeKit vs. Traditional High Availability (HA) Clusters</td>
<td><a href="/#safekit-ha-comparison" title="Detailed comparison of SafeKit software vs traditional hardware-based HA clusters">See SafeKit vs. Traditional HA Cluster Comparison</a></td>
</tr>
<tr>
<td><strong>Technical Resources</strong></td>
<td>SafeKit High Availability: Documentation, Downloads &amp; Trial</td>
<td><a href="/#safekit-ha-technical-resources" title="Access SafeKit free trial, technical documentation, and high availability white papers">See SafeKit HA Free Trial &amp; Technical Documentation</a></td>
</tr>
<tr>
<td><strong>Pre-configured Solutions</strong></td>
<td>SafeKit Application Module Library: Ready-to-Use HA Solutions</td>
<td><a href="/#safekit-ha-application-modules" title="Browse the library of pre-configured SafeKit modules for automated application failover">See SafeKit High Availability Application Modules</a></td>
</tr>
</tbody>
</table>
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