Sounds odd but it could work - disk controller heads are stateless

Storage Architect There s an almost religious divide between those who see containers as entirely stateless objects and others taking a more pragmatic approach that says state and containers is an inevitable thing.

In practical terms, this idea just doesn t work, because in the enterprise, we have to meet a set of standards around application availability, auditing and compliance.

Assuming we want to containerise our databases rather than relying on them remaining as virtual machine instances and we surely will, then persistent data is as inevitable as death or taxes.

As an example, many vendors provide the ability to perform head upgrades on their dual controller-based systems.

This is because persistent data and configuration information is stored on the media HDDs and SSDs and in many cases the media is self-describing.

The text above is a summary, you can read full article here.