5 Critical Capabilities Your Emulation Platform Must Have (That Many Don’t)

Prepare:

• Note the critical information related to your legacy systems (hardware model, OS version, application load type) before considering emulation software.
• Jot down what’s non-negotiable for you: uptime requirements, regulatory commitments, support response times, disaster recovery or backup dependencies.
• Set historic performance baselines on your existing hardware to evaluate against emulation benchmarks during evaluation.

What to look for:

• Reference customers in your industry that are already running the OS and application stack you have in production.
• Formal testing across multiple use cases. Check for financial transaction processing, industrial control systems, and government record systems. This is the only real confidence signal with varied validation.
• A commercial support model with defined SLAs. GitHub issue trackers are not a support channel for production infrastructure.

Capability 2: OS Support That Doesn’t Interrupt Trusted Applications

Business-critical legacy applications often use certain operating systems like Solaris, OpenVMS, HP-UX, MPE, Tru64 and RSX-11. These are the result of decades of institutional knowledge, patchwork and configuration that is basically lost in other operating systems.

The emulation platform you choose must support these OS versions accurately.

Prepare:

• List OS versions across all legacy systems, including patch levels where available.
• Identify any applications with known OS-level dependencies, such as specific kernel calls, device driver behavior, or timing-sensitive operations.

What to look for:

• Explicit OS support documentation, version by version. Vague claims about broad compatibility can be a red flag.
• Evidence of mission-critical use cases. This shows that your actual workloads will behave correctly on that OS after emulation.
• Vendor track record of maintaining OS compatibility as the underlying host infrastructure changes.

Capability 3: Native Integration with Leading Cloud Providers

Most IT roadmaps include some form of cloud consolidation. Even if your legacy systems aren’t moving to the cloud immediately, your emulation platform should support that path. Locking into a solution that only works on-premises means you’ll face this evaluation again in a few years, except under more time pressure.

A recent example: Stromasys helped a major European multisector company consolidate multiple legacy environments (spread across different parts of the country) into a single virtual data center by deploying and running Charon solutions. This move eliminated the dependency on on-premise, aging hardware. Most importantly, the solution enables the customer to run their legacy workloads on modern cloud hosts. And this type of deployment is only possible when you choose a solution that supports cloud migration.

Prepare:

• Make sure you understand your current and future ties with cloud service providers, such as any agreements you have made or contracts you have signed.
• Make a list of network dependencies for each legacy system.

What to look for:

• Proven deployments on the particular cloud providers that your organization utilizes or plans to migrate, including detailed application-level performance parity for on-premises and cloud-hosted instances.
• Cloud marketplace availability for easy procurement, billing and compliance for procurement teams
• Hybrid deployment support, allowing a phased migration by running some emulated systems on-premises while others run in the cloud simultaneously.

Capability 4: Reduction in On-Premises Costs

Legacy hardware never gets cheaper to maintain. Replacement parts become scarce. Vendor support contracts get expensive. The physical hardware consumes massive power and cooling. In fact, legacy infrastructure often consumes 60% of an IT budget.

Emulation addresses this directly. Replacing physical SPARC hardware with an emulated equivalent consolidates your footprint. You eliminate the parts scarcity problem. The operational cost profile drops. Emulation breaks that cycle without forcing application rewrites.

Prepare:

• Build a current-state cost model.
• Identify systems with the highest total cost of ownership.

What to look for:

• Ask for vendor-provided TCO analysis tools.
• Check consolidation ratios.
• Find licensing models that scale with your environment.

Capability 5: Zero Cloud Performance Overhead

Performance drops often ruin cloud emulation projects. Running emulated workloads on a cloud host adds abstraction. Without specific engineering, the performance penalty hurts.

Many legacy workloads are compute-intensive. Batch processing needs speed. Even if you migrate successfully, latency destroys the value of cloud hosting.

Fortunately, enterprise emulators are designed keeping this aspect in mind. For instance, Charon-SSP 6.0 (Stromasys’s SPARC emulator) comes with the MMU pass-through feature.