alt Hacker NewsNo they're not. At CERN physics data is on:
* CTA for tape storage: https://cta.docs.cern.ch/v5/
* EOS for disk storage: https://eos-web.web.cern.ch/eos-web/
There is a large CEPH cluster as well but that isn't really used for physics data.
Replies
Interesting, they used to be the largest ZFS user.
Hard to Google for it without getting AI slop on it, but apparently they built their own stack in 2019.
Not sure I like their solution, "Meta-data is persisted in RocksDB databases using a proprietary KV store called QuarkDB." Unless QuarkDB has magically removed RocksDB's amazing ability to corrupt and lose data frequently, this whole thing sounds like a bad idea.
Also, their data is not stored on any one system (local XFS, Ceph, Lustre), a recipe for disaster.
More specifically, from the EOS page:
> Data is stored natively in XFS filesystems on hard disks or SSDs or on virtualised back-end storage (e.g. RADOS block devices) or distributed filesystems like Lustre or CephFS.