A Harbor-side Chat on CephFS
summary
Tentacle adds case-insensitive subtrees (per-directory, Unicode-normalization and encoding choices) and a file block diff API that already landed in code and is being wired into the CephFS mirror daemon so backups only transfer changed blocks; monitoring gains live log-replay and data-scan progress so MDS replay or a six-figure‑hour rebuild is no longer opaque (users reported a 140‑day stuck cleanup); Umbrella exposes per-subvol IO metrics to Prometheus and upstream work enables user‑space fscrypt compatibility with kernel 6.6 and MDS.
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chapters (10)
- 0:00Introduction and speaker background
- 1:07Tentacle updates and features
- 8:56Umbrella updates and FSCrypt support
- 12:50Open discussion and Q&A begins
- 17:17MDS cache journal and metadata pool explained
- 22:39MDS journal trimming and client issues
- 26:11Per subvol metrics and block diffing
- 30:56MDS restart and journal growth concerns
- 33:51MDS upgrade strategies and future plans
- 35:43File system layout changes and conclusion
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