You've invested in the infrastructure. The racks are installed, the power is connected, and the equipment is ready for service. But before production workloads begin, how do you know everything has been installed correctly, performs as expected, and will continue operating reliably long after handover?
That's where commissioning, Site Acceptance Testing (SAT), and data centre audits each play a different role.
While these terms are often used interchangeably, they serve distinct purposes at different stages of a data centre's lifecycle. Together, they help ensure your infrastructure is installed correctly, performs as designed, and continues operating safely and efficiently for years to come.
Here's what they involve, why they matter, and what's at risk if you skip them.
Before, During and After Go-Live
Think of commissioning, SAT and data centre audits as three critical checkpoints throughout your data centre's life cycle.
1. Before Go-Live: UPS & Cooling Commissioning
Commissioning is the process of verifying that newly installed equipment has been installed, configured and operates in accordance with the manufacturer's specifications and the project's design requirements.
This stage focuses on individual systems to ensure they are correctly installed before integrated testing begins.
Typical commissioning activities include:
- Verifying equipment installation
- UPS configuration and startup
- Cooling system setup
- Structured cabling verification
- Electrical and mechanical inspections
- Initial functional testing
- Manufacturer and installer sign-off
The goal is simple: Is everything installed correctly and ready for integrated testing?
2. During Go-Live: Site Acceptance Testing (SAT)
Once commissioning is complete, Site Acceptance Testing (SAT) validates that the complete data centre environment performs as intended under real operating conditions before being handed over for production use.
SAT tests how systems work together, ensuring the facility meets both technical specifications and your operational requirements.
Typical SAT activities include:
- UPS load testing
- Generator and mains power failover testing
- Cooling performance and redundancy testing
- Integrated systems testing
- Alarm and monitoring verification
- Network resilience testing
- Emergency shutdown testing (where applicable)
- Customer witnessing and formal acceptance sign-off
The goal becomes: Does the entire environment perform reliably under real operating conditions?
3. After Go-Live: Data Centre Audits
Once a data centre is operational, infrastructure naturally changes over time. Equipment is added, workloads increase, documentation becomes outdated, and environmental conditions evolve.
A data centre audit provides an independent assessment of your live environment, identifying risks, inefficiencies and opportunities for improvement.
Unlike commissioning and SAT, audits can be performed at any point throughout the life of a facility.
Typical audit activities include:
- Power infrastructure assessments
- UPS, PDU and redundancy reviews
- Cooling and airflow analysis
- Rack layout and capacity assessments
- Structured cabling inspections
- Physical security reviews
- Environmental monitoring verification
- Fire suppression system assessments
- Documentation and asset register reviews
- Capacity planning and infrastructure recommendations
The goal is: Is the environment still operating safely, efficiently and as intended?
Commissioning vs SAT vs Data Centre Audits
Although they complement one another, each process serves a different purpose.
| Stage | 1. Commissioning | 2. Site Acceptance Testing (SAT) | 3. Data Centre Audit |
| When? | Before go-live | Immediately before handover and go-live | After go-live, or before upgrades, migrations and major changes |
| Primary purpose | Verify correct installation and configuration | Validate operational performance | Assess the health and condition of the live environment |
| Focus | Individual equipment and systems | Integrated facility performance | Entire operational facility |
| Functional testing | ✓ Basic equipment testing | ✓ Comprehensive operational testing | ⚠ Only where required |
| Load and failover testing | ⚠ Limited | ✓ Core focus | ⚠ Assessment only unless specifically commissioned |
| Documentation | Installation records | Test reports and customer sign-off | Asset registers, as-built drawings and compliance documentation |
| Typical outcome | Equipment ready for SAT | Operational readiness and customer acceptance | Recommendations for remediation, optimisation and future planning |
In simple terms:
- Commissioning confirms equipment has been installed correctly.
- SAT confirms the complete solution performs as expected.
- A data centre audit confirms your live environment remains reliable, compliant and fit for purpose.
Why all three matter
Each stage reduces risk at a different point in the project lifecycle.
- Commissioning identifies installation issues before integrated testing begins.
- SAT validates that the entire facility performs correctly before production workloads are introduced.
- Data centre audits help identify hidden risks, infrastructure drift, capacity constraints and documentation gaps long after the project has been completed.
Together, they reduce the likelihood of:
- Unplanned downtime
- Hidden single points of failure
- Safety risks
- Compliance issues
- Unexpected infrastructure failures
- Costly remediation after go-live
When Should You Conduct Commissioning, SAT or a Data Centre Audit?
Commissioning and SAT
These are essential for:
- New data centre builds
- New equipment installations
- Infrastructure upgrades
- Power and cooling expansions
- Before production workloads commence
- Prior to customer or operational handover
Data Centre Audits
Audits are recommended:
- For existing facilities
- Before major migrations
- Following outages or infrastructure failures
- Prior to capacity expansion
- During compliance reviews
- After a change in ownership or tenancy
- As part of ongoing preventative maintenance programmes
The Risks of Skipping These Critical Steps
Skipping commissioning, SAT or routine audits may save time during a project, but it often creates far greater costs later.
Potential consequences include:
- Unexpected downtime caused by untested infrastructure
- Hidden installation defects
- Reduced system resilience
- Voided equipment warranties
- Inaccurate documentation
- Compliance exposure
- Safety hazards
- Paying for capacity that isn't actually available
- Expensive remediation after systems are already live
If you're unsure whether your environment needs an audit, it's often a sign one is overdue.
How Treske Can Help You
At Treske, we support organisations throughout the entire data centre lifecycle—from initial infrastructure deployment through to long-term optimisation.
Before Go-Live: We work alongside project teams to commission critical infrastructure, ensuring power, cooling and supporting systems are installed correctly and ready for testing.
During Go-Live: Our experienced engineers conduct comprehensive Site Acceptance Testing (SAT), validating that integrated systems perform reliably under real-world operating conditions before handover.
After Go-Live: Once your facility is operational, we provide independent data centre audits, preventative maintenance, infrastructure assessments and optimisation services to help maximise performance, improve efficiency and reduce operational risk throughout the life of your facility.
Whether you're building a new facility, upgrading existing infrastructure or looking to better understand the health of your current environment, Treske can help you move forward with confidence.
Speak with our team today to discuss your next project or infrastructure assessment.