On-premises vs. cloud
On-Premises IBM Power vs. Cloud: How to Decide
A side-by-side look at keeping IBM i, AIX, and Linux workloads on owned Power hardware versus moving them to a hosted or cloud operating model.
Independent guidance — not tied to a single hardware vendor or hosting provider.
Should we keep IBM Power on-premises or move to the cloud?
Keep IBM Power on-premises when you need full control, have in-house skills, and your workload is stable or tightly regulated. Move to cloud or hosted Power when you're facing a hardware refresh, exiting a data center, need better disaster recovery, or want to shift from capital to operating expense. Most organizations land on a hybrid answer rather than an all-or-nothing choice.
Common triggers
What usually forces this decision
This choice rarely happens on its own timeline. It’s typically forced by one of a few recurring events:
- Hardware refresh cycle — current Power hardware is approaching its end-of-support date.
- Data center exit or lease expiration — the facility housing the hardware is being consolidated or closed.
- Disaster recovery gaps — an audit or a near-miss reveals recovery objectives the current setup can’t meet.
Start here
Who this comparison is for
The right answer depends on who's asking and what they're optimizing for.
Chief Information Officers (CIOs) and IT Directors
Weighing a multi-year infrastructure commitment against budget cycles and organizational risk tolerance.
Infrastructure and Operations Leads
Responsible for uptime, capacity planning, and the operational impact of a platform change.
Finance and Procurement
Comparing capital versus operating expense treatment and total cost of ownership across the useful life of each option.
Side-by-side view
How the two paths compare
| Option | Capital expense | Operating model | Control | Scalability | Typical risks |
|---|---|---|---|---|---|
| Keep on-premises | High — hardware, facility, power, and cooling capital outlay (directional; depends on configuration) | Self-managed; in-house team owns day-to-day operations | Full control over hardware, firmware, and change windows | Bounded by owned capacity; scaling requires new capital purchases | Hardware end-of-life, capacity ceilings, key-person dependency |
| Move to cloud/hosted | Low upfront — shifts to operating expense, typically subscription- or consumption-based | Provider-managed infrastructure; shared or fully managed operations | Shared control; governed by provider service-level agreements (SLAs) and contract terms | Elastic within the provider's available capacity and regions | Vendor and data-residency fit, migration and cutover risk |
Where each path works best
Best-fit and caution scenarios
Best fit
Best fit for staying on-premises
Regulated workloads with strict data-residency requirements, recently refreshed hardware still within its useful life, and teams with strong in-house Power skills.
Use caution
Use caution with on-premises
Hardware nearing end-of-support, difficulty hiring or retaining Power and IBM i skills, or an approaching data center lease expiration.
Best fit
Best fit for cloud or hosted Power
Organizations facing a data center exit, wanting to convert capital spend to operating expense, or needing stronger disaster recovery coverage.
Use caution
Use caution with cloud or hosted Power
Applications with strict low-latency dependencies on co-located systems, or workloads where data-residency and contract terms don't fit your regulatory requirements.
Cost factors
What drives the cost comparison
Licensing and software terms
Some independent software vendor (ISV) and IBM licensing terms shift when an application moves to a different physical or virtual environment.
Facilities and power
On-premises costs include facility space, power, cooling, and physical security that hosted options fold into a service fee.
Staffing and administration
Self-managed environments carry ongoing administration cost; managed and hosted options shift some of this to the provider.
Data transfer and migration
One-time migration effort, testing, and potential parallel-running costs during cutover.
Before you decide
Questions to work through first
Confirm current hardware and contract timing — check end-of-support dates and any facility lease or contract expirations driving the decision.
Inventory licensing dependencies — identify IBM i, AIX, and ISV licensing terms that may change with a different physical or virtual environment.
Define recovery objectives — establish the recovery time and recovery point objectives the next environment needs to meet before comparing options.
On-premises vs. cloud: frequently asked questions
Is on-premises IBM Power more expensive than cloud in the long run?
It depends on utilization, facility costs already sunk, and how long the hardware stays in service. On-premises shifts spend to capital expense, while cloud and hosted options shift it to operating expense — compare total cost over the full useful life of each option rather than year one alone.
Can we move only part of our IBM Power estate to the cloud?
Yes. Many organizations run a hybrid model, keeping latency-sensitive or heavily customized workloads on-premises while moving disaster recovery, development and test, or lower-priority production workloads to a hosted or cloud environment.
What usually triggers this decision?
The most common triggers are an approaching hardware end-of-support date, a data center lease expiration or exit plan, an audit finding a disaster recovery gap, or difficulty staffing in-house Power and IBM i skills.
Does moving to the cloud mean rewriting our applications?
No. Moving infrastructure and changing how an application is built are separate decisions — most infrastructure moves are a lift-and-shift of existing IBM i, AIX, or Linux workloads with no application rewrite required. See our migrate vs. modernize comparison for more on that distinction.
How long does an on-premises to cloud migration typically take?
Timelines vary widely based on workload count, network complexity, and testing requirements. A phased plan that starts with a lower-risk pilot workload is common practice regardless of the target environment; exact timelines depend on your environment.
Sources
- IBM Power Systems product and support documentation (ibm.com)
- IBM Cloud — Power Virtual Server documentation (cloud.ibm.com)
- Individual provider or colocation facility contract terms (verify directly)
Actual suitability depends on your workload, software licensing terms, application support requirements, geography and data residency, target architecture, and each provider’s contract terms.
Ready to Pressure-Test Your Infrastructure Decision?
Get an independent assessment of your current environment and a directional comparison of staying on-premises versus moving to cloud or hosted Power.