What should we check before running MongoDB on IBM LinuxOne?

First question is whether the exact MongoDB edition and version you need are supported natively on the Linux distribution and s390 architecture you plan to use. Don't assume a Linux package for another architecture will work.

Check the whole stack too: drivers, monitoring agents, backup tools and any native dependencies. If something needs a custom build or emulation, find out who will maintain it and whether the vendors will support the setup.

What's the actual requirement driving LinuxOne here? If the goal is availability or capacity for MongoDB, compare it with a replica set or sharded deployment on conventional servers. Get both options sized for the workload rather than comparing hardware specs alone.

Get a complete quote before deciding. The machine price is only part of it, with storage, software licensing, support and staffing all potentially adding to the bill. Then compare that with buying or renting enough conventional servers to meet the same requirements.

Also consider who will operate it. A premium machine still needs configuration and ongoing administration, and engineers familiar with the platform may be harder to find. Check the available support channels and documentation for the particular software versions before committing.