What an AIX migration timeline looks like
A lift-and-shift of AIX to cloud Power typically runs 3–6 months from decision to cutover. An AIX-to-Linux replatform takes far longer, because application work sets the pace.
Most AIX cloud migrations are lift-and-shifts to cloud Power AIX hosting, which keep the operating system and applications intact and typically run 3–6 months from decision to cutover. An AIX-to-Linux replatform is a different animal, 9–18 months or more, because recompiling, testing, and sometimes rewriting the application, not the infrastructure, drives the schedule.
The four phases of an AIX lift-and-shift
Discovery & assessment · weeks 1–4
LPAR and workload inventory, AIX versions and hardware support dates, ISV licensing, RTO/RPO, and destination shortlist.
Design & pilot · weeks 4–10
Target sizing on cloud Power, network and connectivity design, a pilot LPAR migration, backup/DR approach, and go/no-go criteria.
Migrate & validate · weeks 10–22
Move non-production first, then production LPARs in waves, validating performance and integrations at each gate.
Optimize & close · weeks 22–26
Right-size capacity, confirm HA/DR, update runbooks, train the team, and decommission the old hardware.
An AIX-to-Linux replatform adds a long application track, recompile, test, and remediation, on top of this, which is what stretches it to 9–18 months or more. We scope which path fits before committing to a date.
Frequently asked questions
How long does an AIX cloud migration take?
A lift-and-shift to cloud Power typically runs 3–6 months from decision to cutover. An AIX-to-Linux replatform takes 9–18 months or more, because the application work drives the schedule.
What makes an AIX migration take longer?
Application work. A lift-and-shift keeps AIX as-is, so it's fast. A replatform to Linux adds recompile, test, and remediation cycles that can multiply the timeline several times over.
Can I migrate AIX in waves?
Yes, and most projects do. You move non-production first, then production LPARs in waves, validating performance and integrations at each gate before the next wave.
When can I decommission the old hardware?
In the final phase, after capacity is right-sized, HA and DR are confirmed on the new platform, runbooks are updated, and the team is trained on the cloud environment.
What an AIX timeline looks like in practice
A lift-and-shift to cloud Power usually runs 3–6 months; the variables decide where you land. Two representative timelines.
Situation. A handful of AIX LPARs, clean dependencies, and one maintenance window available.
Approach. A single-wave lift-and-shift to cloud Power with a full test cycle before cutover.
Outcome. Live in roughly three months, with testing sign-off, not infrastructure, setting the pace.
Situation. Dozens of AIX systems with tangled interdependencies and tight change control.
Approach. Wave migrations across several windows, decommissioning old hardware as each wave proves out.
Outcome. Closer to six months end to end, with risk spread across waves instead of one high-stakes weekend.
Representative scenarios reflect common IBM Power migration patterns and typical ranges, not specific named client engagements.
An AIX migration planning checklist
A lift-and-shift to cloud Power runs 3–6 months; the variables below are what move that number. Map them before you commit to a date.
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