I am not talking about cache. The main issue for me with cache is at the beginning the first block is searched through the slow disk, then put in cache.
I want often read blocks to be definitively on faster disks if there is some and stay on it. And consequently move less often read blocks from fast storage to slower ones.
So it looks to me that zfs has this feature, but I am not sure on the name it deserves if I want to compare to other kinds of filesystem like Btrfs or Ceph, or other kind of storage. It looks like Adaptive replacement cache but without the cache part.
Professional storage solutions like HPE 3PAR or EMC Avamar have such features, like
adaptive optimization but they give it some special proprietary name, and I can not use these names to compare with open source solutions.
How would you name such a feature?
- edit : thanks to slm to direct me to RPAC : regional popularity-aware cache, it drive me then to Automated tiered storage