HSM: The Original Tiering Engine Behind Mainframes, Cloud, and S3
If you think “tiering” started with SSD caches and cloud storage classes… congratulations: you’ve been successfully marketed to. Hierarchical Storage Management (HSM) has been doing the same core job for decades: Keep “hot” data on fast, expensive media… push “cold” data to slower, cheaper media… and make the user mostly forget you exist—until recall latency reminds them you do. What changed over 50-ish years isn’t the idea. It’s the media, the interfaces, the scale, and the **ways vendors […]