Choose a colocation provider by testing a specific facility against your workload, not by accepting a generic uptime claim or a marketing checklist. Before requesting final pricing, document your required location, latency, rack space, power density, cooling, connectivity, compliance scope, security controls, support model, growth rate and contract limits. Then ask every provider the same questions and require evidence for answers that affect availability, security or cost.
The questions below turn that process into an RFP and site-visit framework. They cover facility resilience, operations, network paths, assurance, support and commercial terms—the areas that determine whether a site remains usable during failures, maintenance, expansion and an incident.
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1. Define your workload and non-negotiable requirements first
A provider cannot be evaluated fairly until you describe what the facility must support. Write a short requirements brief and give the identical version to every bidder.
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- How many racks or cabinets are needed at launch, and what is the expected quantity at each expansion point?
- What is the normal and peak power draw per rack? State whether figures are measured at the rack, cabinet or facility feed.
- What equipment dimensions, weight, cabling and airflow direction must the room accommodate?
- What deployment date, installation sequence and maintenance windows are acceptable?
- Which systems are latency-sensitive, and what maximum round-trip latency is acceptable to users, offices, cloud regions and recovery sites?
Business and regulatory constraints
- Which countries, jurisdictions or city limits are acceptable for data residency and operational access?
- Does the location face relevant flood, wildfire, storm, seismic, utility or political risks? What geographic separation is required for a recovery site?
- Which laws, customer commitments, industry rules and audit obligations apply to the workload?
- Which tasks remain your responsibility—hardware, operating systems, backups, encryption keys, patching and incident response—and which are included in colocation?
Ask the provider to confirm each requirement in writing rather than assuming that a standard package includes it. A low monthly quote can become expensive if power, cross-connects, remote hands or compliance evidence are separate services.
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2. Confirm the exact facility and whether it fits
“We operate data centers in this region” is not enough. Obtain the street-level facility name and the legal entity that will contract for it. Check the site against latency, residency and continuity requirements, then request a tour or an independently verified assessment.
Questions for the site
- Which exact building and data hall will host the equipment?
- What space, power per rack, cooling capacity and loading limits are available now?
- How much additional capacity is physically funded and permitted, and how is it reserved for existing customers?
- Are there restrictions on cabinet height, floor loading, battery chemistry, generators, liquid cooling or high-density deployments?
- What construction, utility or neighboring-tenant work could affect the hall during your term?
Ask for a current capacity report or equivalent evidence showing available electrical, cooling and white-space headroom. Capacity management is a continuing discipline: a facility that is adequate at signing may become constrained as other customers deploy.
3. Test power and cooling resilience, not just the headline tier
Request a diagram and a plain-language failure narrative for the power and mechanical systems serving your hall. You need to understand what happens when a component fails, a maintenance procedure is active or a utility supply is lost.
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Power questions
- What is the electrical topology from utility entrance to the rack, including switchgear, generators, UPS systems, distribution units and rack feeds?
- Are feeds genuinely independent, and where do shared points of failure exist?
- What happens after loss of a utility feed, UPS module, generator, breaker or distribution path?
- How often are generators, UPS systems, automatic transfer equipment and batteries tested, and are tests conducted under load?
- How are fuel supplies, battery replacement and deferred electrical work tracked?
Cooling questions
- What cooling architecture serves the room, and what temperature and humidity ranges are maintained?
- What happens when a chiller, pump, fan, cooling distribution unit or control system fails?
- Can the design support your rack density without relying on undocumented operating assumptions?
- How are hot spots detected, reported and corrected?
Ask to see maintenance procedures, test records and the list of systems excluded from redundancy. Redundancy labels vary; a diagram that appears “N+1” may still contain a shared switchboard, control network or fuel system.
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4. Verify certification and assurance for the facility you will use
Certifications are useful only when their scope, stage and validity match your purchase. Ask for the certificate, statement of applicability, report period and issuing body for the exact building and service.
Uptime Institute Tier evidence
Uptime Institute describes Tier certification as verification that the Tier Standard has been applied at defined design, constructed-facility and operational stages. Ask which stage has been certified, the facility address covered, the certificate’s current status and any limitations. A design document certification is not the same evidence as certification of the completed facility, and neither is a guarantee that your application will be available.
Audit and management reports
- Which reports or certifications cover the building, the colocation service and the period in which you will operate?
- What systems, locations, subcontractors and customer responsibilities are out of scope?
- Can you review the report under a confidentiality agreement, and are exceptions or management responses disclosed?
- How are corrective actions tracked and re-tested?
ISO 9001 and ISO 14001 can indicate quality-management and environmental-management practices, but they are not direct proof of data-security controls. Treat every certificate as a bounded piece of evidence and map it to your own control requirements.
5. Examine operations, maintenance and staffing
Facility design reduces risk only when people operate it consistently. Ask how preventive maintenance, incidents, staffing and supplier performance are controlled.
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Maintenance and incident handling
- How are preventive tasks scheduled, approved, verified and closed?
- How is deferred or overdue work escalated, and can customers see relevant exceptions?
- How are incidents investigated, with timelines, root-cause analysis and corrective actions?
- Which critical systems are monitored continuously, and who receives alarms outside business hours?
- How are simultaneous maintenance activities prevented from removing the same resilience path?
People and suppliers
- What staff are physically on site during each shift, and what specialist coverage is available overnight?
- What training, competency checks and authorization levels apply to personnel working on critical infrastructure?
- How are contractors and equipment vendors qualified, supervised and granted access?
- What response and completion times are written into vendor contracts for critical repairs?
These questions follow the management-and-operations areas identified by Uptime Institute: maintenance, staffing, training, monitoring, capacity management and vendor support. Ask for examples of completed maintenance and a recent incident report with sensitive details redacted.
6. Check physical security and compliance boundaries
Separate protection of the building from protection of your systems. A facility attestation does not automatically secure your servers, credentials, applications or data.
Physical controls
- How are visitors, customers, contractors and deliveries authenticated and escorted?
- Are cages, cabinets and media-storage areas separately controlled?
- What cameras, alarm systems and access logs exist, and how long are records retained?
- How quickly can access be revoked when an employee or contractor leaves?
- What is the procedure for evidence preservation after a suspected intrusion?
Compliance scope
- Which security attestations apply to the facility, the purchased service and the relevant reporting period?
- Are your workloads, tenant areas and remote-hands activities included or excluded?
- How are audit requests, regulator visits and customer questionnaires handled?
- How are continuing third-party risks, subcontractors and material control changes reviewed?
Request a control matrix showing the provider’s responsibility and your responsibility for every requirement. Resolve gaps before contract signature rather than relying on a general statement that the site is “compliant.”
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Network availability is site-specific. Ask for the carrier and exchange inventory for the exact facility, then verify how paths enter and traverse the building.
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Carrier and cloud options
- Which carriers, internet exchanges and cloud-connectivity services are available in this building and hall?
- Can you order two providers without using the same internal meet-me room, riser or entrance?
- What cross-connect products, installation lead times, recurring fees and change procedures apply?
- Who owns and operates each segment between your rack, the meet-me room and the external carrier?
Route-diversity evidence
Ask the provider to show physically diverse entrances and internal routes for the specific service you are buying. Two circuits sold as redundant may share a conduit, street trench, entrance room, power source or carrier handoff. Request diagrams or carrier letters that identify shared points, and include the required diversity in the order and SLA.
8. Define remote hands and support before an emergency
Colocation contracts differ greatly in what technicians may do and how quickly they respond. Convert support expectations into a written service catalog.
- What installation, labeling, cabling, reboot, media replacement and inventory services are included?
- Which tasks require your pre-approval, a change ticket or an on-site engineer?
- What are the contractual response and completion targets for standard, urgent and emergency requests?
- Is support available 24/7, and how are incidents escalated when the primary contact is unavailable?
- How are remote-hands hours, materials, travel, escorts and after-hours work charged?
Ask for sample tickets and escalation paths. Ensure that emergency authority, contact verification and access permissions are defined before a failure occurs.
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The service-level agreement determines what the provider actually promises. Do not infer remedies from a facility tier or sales presentation.
SLA measurement
- How is availability measured: at the utility feed, rack power, cooling condition, network port or another service boundary?
- What measurement windows, aggregation rules and monitoring sources apply?
- Which maintenance, customer-caused events, carrier failures, force-majeure events and capacity limitations are excluded?
- What service credits or other remedies apply, and are they the sole remedy?
- What notice, evidence and claim deadlines must you meet?
Term, price and flexibility
- What are the initial term, renewal mechanics, termination rights and notice periods?
- How can prices change, and are power, cooling, cross-connects, remote hands and compliance services priced separately?
- What minimum power or space commitment applies if your actual draw is lower?
- How are additional racks, higher-density cabinets and new connectivity ordered and priced?
- What happens to equipment, data, access and assistance at exit, and what removal or decommissioning charges apply?
Have legal, security and finance reviewers examine the same draft. Confirm that quoted assumptions about power, expansion and support appear in enforceable schedules.
10. Compare providers on one evidence-based scorecard
When multiple facilities meet the basic requirements, score them on identical dimensions. Weight each dimension according to the business impact of your workload; there is no universal weighting that fits every organization.
| Dimension | Evidence to compare | Decision question |
|---|---|---|
| Location and workload fit | Facility address, latency, geographic hazards, residency and deployment date | Does this site satisfy operational and continuity constraints? |
| Power and cooling | Topology, failure behavior, maintenance records and available headroom | Can the site sustain the load during failure and planned work? |
| Certification and audit scope | Current certificates, report periods, exceptions and out-of-scope services | Does the evidence cover this building and your obligations? |
| Connectivity | Carrier inventory, entrance diagrams, route diversity, lead times and fees | Can independent paths be delivered for the required service? |
| Security and compliance | Access controls, logs, attestations, control matrix and review process | Are facility controls sufficient for your risk and audit needs? |
| Operations and support | Staffing, training, maintenance, monitoring, remote-hands scope and response targets | Will qualified help be available when systems or people fail? |
| SLA and contract | Measurement, exclusions, remedies, term, price changes and exit clauses | Are promises measurable, enforceable and financially tolerable? |
| Expansion and total cost | Reserved capacity, power commitments, cross-connects, labor and growth pricing | Can you scale without a disruptive or uneconomic renegotiation? |
Record the answer, the evidence supplied, its date and any unresolved assumption. A provider that refuses facility-specific documentation should not receive the same score as one that supplies verifiable records.
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11. Use a disciplined RFP and site-visit process
- Freeze the requirements brief. Document workload, location, capacity, network, compliance, security, support and growth assumptions.
- Send identical questions. Require answers in a common template, with each exception and charge clearly identified.
- Request evidence. Collect topology diagrams, certificates, audit summaries, maintenance and test records, capacity information, support schedules and draft SLA language.
- Conduct the site visit. Walk access points, loading areas, data halls, meet-me rooms, power and cooling plant where permitted. Ask operators to explain a component failure and a concurrent maintenance event.
- Verify critical claims independently. Confirm certification status with the issuing organization, validate carrier route diversity with the carriers, and reconcile quoted capacity with the proposed hall.
- Run failure and growth scenarios. Ask what happens during utility loss, a cooling failure, a carrier cut, an urgent hardware replacement and a doubling of rack demand.
- Negotiate the evidence into the contract. Attach facility identifiers, service boundaries, diversity requirements, response targets, exclusions, remedies, expansion assumptions and exit duties to the final agreement.
- Approve only documented exceptions. Assign an owner and risk treatment for every requirement the provider cannot meet.
12. Warning signs that require clarification
- A provider gives a regional availability claim but will not identify the building or hall.
- “Redundant” power or network paths are described without diagrams or shared-point disclosure.
- A certificate is presented without its stage, address, scope, reporting period or exceptions.
- Capacity is described as available without a reservation method, power-density limit or expansion plan.
- Maintenance, staffing, training or remote-hands promises are verbal rather than contractual.
- The SLA excludes broad categories of events, measures a different service boundary than your workload, or offers no meaningful remedy.
- Price assumes a long-term power commitment or paid extras that are absent from the initial quote.
Resolve these issues with evidence and contract language. If an answer remains uncertain, treat the uncertainty as a risk in the comparison rather than awarding the provider the benefit of the doubt.
Make the selection decision
Select the provider whose documented facility and contract best match your workload’s highest-impact constraints—not necessarily the one with the broadest certification list or lowest headline price. A defensible decision shows the exact site, tested resilience, route diversity, operational capability, assurance scope, support response, measurable SLA and realistic expansion path. Keep the scorecard and evidence package for renewal reviews, audits and future capacity decisions.
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