Definition
HAaaS shifts high availability from a software purchase the internal team operates to a managed service a provider operates, typically including real-time replication, 24x7 monitoring, patching, and periodic role-swap testing. The buyer still needs to define continuity requirements and approve test schedules, but day-to-day HA operations move to the provider.
This model tends to appeal to IBM i teams that agree HA is necessary but do not have staff available to manage replication, monitor lag, and run failover tests on a disciplined schedule.