By Linux has built its enterprise reputation on stability. It runs the infrastructure underneath the world’s most critical systems — databases, ERP platforms, financial systems, healthcare applications. But stability and high availability are not the same thing, and in enterprise Linux environments, the difference between the two often comes down to a stack of custom shell scripts, a few engineers who wrote them, and a cluster configuration nobody else fully understands.
When Windows administrators configure a high availability cluster, they work within Windows Server Failover Clustering — a built-in, application-aware framework that understands the applications it protects. It ships with tooling, it has GUI management, and its behavior is documented and predictable. Linux offers something different: a set of powerful, flexible building blocks. Pacemaker, Corosync, Heartbeat — these components can be assembled into a highly capable cluster, but the application-awareness layer has to be built by the team deploying them. That means custom scripts to monitor the application, handle partial failures, manage storage, control network resources, and coordinate recovery in the correct sequence.
The problem with that approach is not that it cannot work — it often does, at least initially. The problem is that it is inherently fragile over time. Scripts are written by specific engineers. Applications get updated. Script logic that worked against one version of a database fails silently against the next. And the engineers who built the original system move on, take other roles, or simply aren’t available when something breaks at 2am. At that point, the organization discovers that their high availability cluster isn’t highly available — it’s a configuration that worked when it was deployed and hasn’t been tested since.
SIOS Technology built SIOS LifeKeeper for Linux to solve exactly this problem. Rather than leaving the application-awareness layer to custom scripting, LifeKeeper ships with Application Recovery Kits — pre-built, vendor-validated integration packages for the applications enterprises actually run: SAP, SAP S/4HANA, Oracle, SQL Server on Linux, PostgreSQL, and more. These ARKs encode not just monitoring logic, but the correct failover sequence for each application, validated against specific versions, maintained by SIOS as applications update.
At Red Hat Summit 2026 in Atlanta, SIOS is engaging the Red Hat Enterprise Linux (RHEL) community directly — specifically the teams running mission-critical workloads on RHEL who are discovering that their existing HA approach has more single points of failure than they realized.
The Guest: Aaron West, Solutions Engineer at SIOS Technology
Key Takeaways
- Linux HA building blocks — Pacemaker, Corosync, Heartbeat — require custom scripting to achieve application awareness, creating institutional knowledge risk when the engineers who wrote those scripts move on.
- SIOS LifeKeeper Application Recovery Kits (ARKs) replace custom scripting with vendor-validated, application-specific failover orchestration for SAP, Oracle, SQL Server on Linux, PostgreSQL, and custom workloads.
- LifeKeeper monitors the entire application environment — server, storage, OS, network, database, and application layer — not just node heartbeat, enabling detection of frozen or degraded application states that heartbeat-only monitoring misses.
- SIOS LifeKeeper deploys anywhere — physical servers, VMs, hyperscaler cloud (AWS, Azure, GCP), on-premises data centers — enabling a single HA solution and a single team skillset across all environments.
- A production-grade HA cluster on Red Hat Enterprise Linux can be operational within hours using LifeKeeper’s wizard-driven GUI and pre-built ARKs, compared to days or weeks of scripting with native Linux HA toolsets.
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In this exclusive interview with Swapnil Bhartiya at TFiR, Aaron West, Solutions Engineer at SIOS Technology, discusses how protecting Linux applications for high availability differs fundamentally from Windows environments, why native Linux HA toolsets create long-term institutional fragility, how SIOS LifeKeeper Application Recovery Kits deliver application-aware automated failover across RHEL, SUSE, Rocky Linux, and Oracle Linux, what the automated failover sequence actually looks like from detection to user reconnection, and what SIOS is looking to discuss with the RHEL community at Red Hat Summit 2026 in Atlanta.
Linux HA vs. Windows Failover Clustering: The Application Awareness Gap
Windows Server Failover Clustering provides a closed, integrated, application-aware high availability framework. Linux offers building blocks — Pacemaker, Corosync, Heartbeat — that are powerful and flexible but leave the application awareness layer entirely to the team deploying them. SIOS LifeKeeper for Linux closes that gap.
Q: Linux has a reputation for being rock solid, but that reputation can create a false sense of security when it comes to high availability. How does protecting Linux applications actually differ from what organizations are already doing on the Windows side?
Aaron West: “The key difference is the fact that with Windows Server Failover Clustering, it’s pretty much built into Windows. You install it, configure it, and it’s aware of the applications it supports. You’ve got a closed set of tools — it’s very Microsoft. With Linux, on the other hand, you have building blocks. You’ve got Pacemaker and Corosync, Heartbeat, and all these other components which are all part of the Linux HA tool set. You can install those components to form your cluster, but you’re basically building the cluster from those components. For any application awareness, you’ve got to get your scripting on — you’re going to be writing scripts to give you that HA experience. The problem with this is — and I’ve done it many times myself, very successfully with the Linux tool set — it’s always required a lot of work, a lot of testing, a lot of QA to make sure it’s actually going to be a rock-solid solution. With something like SIOS, it gives you that Windows experience, if you will. You install SIOS LifeKeeper, and LifeKeeper comes with those specially built scripts which we call Application Recovery Kits. These have been crafted way beyond what you might do in terms of your own simple scripting, because we’ve worked with vendors — people like SAP — to get these scripts to a point where they have a great depth of application awareness. It makes it very simple with the SIOS solution because it’s all point and click once it’s installed. Testing, failover, everything else is an out-of-the-box experience — much like it is with Windows.”
Enterprise Linux Distributions: Does RHEL or SUSE Solve the HA Scripting Problem?
Enterprise Linux distributions from Red Hat and SUSE include some HA tooling and management capabilities — but they do not eliminate the application-awareness scripting requirement that sits at the core of the Linux HA challenge. SIOS ARKs address what enterprise distributions leave unresolved.
Q: When we talk about Linux, are we talking about generic distributions or enterprise distributions? Do RHEL or SUSE Enterprise already bake in enough HA capability that the gap is smaller?
Aaron West: “It’s a good point. You will get different experiences with different Linuxes. If you’re using something non-commercial — like Arch, which doesn’t have a vast support network and is more community-based — those are obviously the harder end, because you’re doing everything yourself. With the more enterprise-grade Linuxes — your Red Hats and your SUSEs — they will have some tools or some level of management built in with HA. And you will find that you have to pay a higher support rate to enable the HA in those distributions, because they’ve got some value-add built in. But it doesn’t take away the pain entirely, even with those more enterprise approaches. Because you’re still having to do the work that we’ve done in our Application Recovery Kits — the actual scripting to monitor the application itself. And it’s not just the application. It’s the whole stack. What if the network goes down? What if it can’t reach the internet? What if the database or application is running but frozen — not actually working? This is where you’ve got to have a deep understanding of the application to actually truly write scripts around it to monitor it and keep it up and running.”
What Workloads Are Organizations Protecting with SIOS LifeKeeper?
Databases have historically been the strongest use case for SIOS, given the single-point-of-failure risk of SAN-based storage in clusters. But the workload mix is broadening — SAP deployments, custom applications, and generic workloads are increasingly common in SIOS environments.
Q: When you look at what customers are actually protecting with SIOS LifeKeeper, is it mostly databases, web servers, or custom applications?
Aaron West: “Databases have always been a sweet spot for SIOS because of the tool set we have. We not only provide an HA solution, but we also solve the typical single point of failure, which is providing shared storage — because a SAN will cause, in a Windows cluster for example, a typical point of failure people need to consider. But to that point, we are seeing a lot more generic applications coming through. There’s an awful lot of SAP — I mentioned that one earlier. And there are also custom applications. People using SIOS can take advantage of our Quick Service Protection and GenApp scripts to create the same level of protection that you get with some of our ARKs, but for their own applications as well.”
The Automated Failover Sequence: What Actually Happens When a Node Goes Down
Understanding the sequence of automated recovery operations is essential for evaluating any HA solution. SIOS LifeKeeper orchestrates a precise, application-aware sequence from failure detection through user reconnection — covering storage, replication reversal, application stack, and network resources in the correct order.
Q: Can you walk us through what actually happens the moment a primary node goes down? How does automated failover work for a Linux application in that scenario?
Aaron West: “With all HA solutions, there’s going to be some kind of link between the members of the cluster — it’s often referred to as a heartbeat. That’s just checking: are my other nodes available? Can I reach them? Are they up and running in a healthy state? With SIOS, we also have the Application Recovery Kits monitoring the application within the actual node in the cluster. Other things are being monitored as well — network connectivity, internet availability, all of those can be configured from within LifeKeeper. So the first thing that happens is it detects the failure, then makes the decision that the primary node has gone down and the application stack needs to come up on the other node. In the case where you’ve got replicated storage, you’re going to bring the storage up first — migrate the storage over to the other node, reverse the replication so that when the dead node comes back to life, data is replicated back to it so you can always fail back later. Then you bring the application stack up — databases, other applications that were running on the server — on the other node. Then you move user connectivity: a floating IP address, or DNS, or whatever the user is connecting through. All of those will move over as long as the other node is in a healthy state. When it’s finished bringing those up, users will then continue their work on the other node — maybe noticing a little bit of lag, but hopefully no downtime is even noticed.”
Multi-Environment Deployment: One HA Solution Across All Environments
Modern enterprises run workloads across physical servers, virtual machines, on-premises data centers, and multiple hyperscaler clouds simultaneously. SIOS LifeKeeper’s environment-agnostic deployment model allows organizations to standardize on a single HA solution and a single team skillset regardless of where workloads run.
Q: Enterprises are not running things in one place — physical servers, VMs, cloud, hybrid, edge. How does LifeKeeper handle application protection consistently across all of these environments?
Aaron West: “I actually think this is a bit of a feature of ours, because we can handle being installed in any environment. LifeKeeper can work anywhere — on your Dell physical server, up in your hyperscaler cloud, in your data center, wherever. We can run on any full computer or server: a virtual machine, a piece of hardware, whatever, as long as you’ve got a full machine to work with. What you end up doing is having a common solution in different places. If I’m working between the data center and I’ve got LifeKeeper in place there, and I’m also working in a cloud environment — I can use LifeKeeper across the board everywhere. You can train your team on one HA solution and have a common solution wherever it may be installed.”
Getting Started on RHEL: From Zero to Production HA in Hours
For Red Hat Enterprise Linux environments specifically, SIOS LifeKeeper’s wizard-driven deployment and pre-built ARKs reduce the time to a production-grade HA cluster from days or weeks of custom scripting to a matter of hours — with built-in validation that catches configuration errors before they become production incidents.
Q: For organizations running critical workloads on Red Hat Enterprise Linux specifically — what does getting started actually look like, and how quickly can they have real HA in production?
Aaron West: “Rather than spending days or weeks scripting, you can get an up-and-running system potentially within a couple of short hours. It’s a case of installing the SIOS LifeKeeper application, which is pretty straightforward — run setup, go through a wizard, and once deployed you access the GUI interface and build out your Application Recovery Kit. You deploy, for example, our DataKeeper shared storage recovery kit, create mirrored storage across your cluster nodes, deploy the ARKs relevant to your database or other applications. We also have ARKs for the environment itself — kits that work in Azure and AWS to tie into their tool sets and move IP addresses, work with load balancers, and so on. It’s all wizard-driven, pretty much next-next-next. And our GUI does a lot of validation because we understand the application — when we have a kit for SAP, we’re talking to the application underneath and can validate the settings. That avoids a lot of the potential mistakes that happen with typos and configuration errors when deploying servers, which happens more often than you might think.”
The Institutional Knowledge Risk: Why Home-Built Linux HA Fails Over Time
The most common and least visible failure mode in enterprise Linux HA is not a technology failure — it is an organizational one. Teams build capable clusters using native Linux tools, then lose the engineers who built them. Applications update. Scripts break silently. The cluster that was designed to prevent downtime causes it instead.
Q: What are the common architectural mistakes you see Linux teams make when they first try to build high availability on their own?
Aaron West: “You’ve kind of hit the nail on the head in that the people side is one of the first things I would highlight. Typically what I’ve seen in companies is that there’ll be a couple of clever people who can come along and do exactly what we’ve said here — use those building blocks, achieve something near SIOS level in terms of the HA solution. But there’s a load of scripts and config files that need to be maintained, and there are only these two people who built the system who actually know how to do any of it. A couple of years down the line — maybe less — those people move on or move to other projects. They’re not available. Then something that wasn’t picked up in testing goes wrong. It could be that the application itself has been updated — we sometimes have to update our ARKs to match the application as they change over time. Something breaks and now no one has the knowledge to fix it. When you’re dealing with an HA solution, it’s not designed to be down — the whole point is that you’re creating a cluster with a massive amount of uptime. So that risk — where a software update could stop your scripts working and take the whole cluster down — is a really big issue. You avoid that by working with something like SIOS, because you’ve got the level of testing we do for Application Recovery Kits, the fact that you can look up which versions work with which versions of the databases or applications you’re running, make sure everything is supported and tested. That’s all done before you get the software, so you’ve got that level of trust already in the solution.”
Red Hat Summit 2026 in Atlanta: Conversations SIOS Is Looking to Have
At Red Hat Summit 2026 in Atlanta (May 11–14), SIOS is looking to engage RHEL practitioners around two specific frontiers: the growing adoption of SQL Server on Linux, and the broader landscape of custom application protection — workloads where LifeKeeper’s GenApp ARK framework can extend enterprise-grade HA to applications that don’t yet have dedicated vendor support.
Q: You’re heading to Red Hat Summit. What conversations are you expecting to have with the enterprise Linux community there?
Aaron West: “I’d like to see some more conversations around SQL Server on Linux — Microsoft SQL Server — I think that’s quite an interesting development over the last few years. But I’d also like to have conversations around doing things other than typical database work: seeing what custom applications are out there, new applications we can support. As many conversations like that as possible will be a real win for us.”
