When Green Lies: Operational Blind Spots in the Ceph Dashboard#1004
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Asif-rehman012 wants to merge 1 commit intoceph:mainfrom
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When Green Lies: Operational Blind Spots in the Ceph Dashboard#1004Asif-rehman012 wants to merge 1 commit intoceph:mainfrom
Asif-rehman012 wants to merge 1 commit intoceph:mainfrom
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Can one of the admins verify this patch? |
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please review @dang @andrewschoen @Thingee |
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@Asif-rehman012 Feel free to tag me for review too. |
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| title: "When Green Lies: Operational Blind Spots in the Ceph Dashboard" | ||
| date: "2026-02-10" | ||
| author: "Aasaf Rehman" |
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This is a different spelling compared to your GitHub handle, is that appropriate?
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anthonyeleven
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anthonyeleven
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LGTM. My usual nits. Take a look at my suggestions then we're good to merge.
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| ## Introduction | ||
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| The Ceph Dashboard has become the default operational interface for most modern |
Contributor
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I would take out "most".
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| The Ceph Dashboard has become the default operational interface for most modern | ||
| Ceph clusters. With cephadm-managed deployments, OAuth 2.0 authentication, | ||
| integrated Prometheus and Grafana access, and multi-cluster visibility, the |
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s/access/observability/
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| *The Ceph Dashboard presenting a healthy cluster view — a familiar starting point for many production incidents.* |
Contributor
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: instead of - please
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| This blog explains why a green dashboard does **not** guarantee a healthy or | ||
| operationally safe Ceph cluster. Focusing on **active releases in 2026 — | ||
| Squid (19.x) and Tentacle (20.x)** — we examine persistent dashboard blind spots, |
Contributor
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Focusing on Squid and Tentacle
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| ## The Role of the Ceph Dashboard | ||
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| The Ceph Dashboard is implemented as a `ceph-mgr` module. It does not generate |
| - Old MGR assumptions | ||
| - Mixed daemon versions | ||
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| In this phase, the dashboard may: |
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| ## Blind Spot #4: Monitoring Without Diagnosis | ||
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| With Tentacle, **Prometheus, Grafana, and Alertmanager** are fronted by the |
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Suggest taking out the double asterisks.
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| ## Blind Spot #5: Scheduler and Throttling Behavior | ||
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| Ceph’s **mClock scheduler** dynamically balances resources between: |
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| ## Conclusion | ||
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| The Ceph Dashboard in Tentacle is powerful, polished, and indispensable. |
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| The Ceph Dashboard in Tentacle is powerful, polished, and indispensable. | ||
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| But no UI — regardless of sophistication — can fully represent the complexity |
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This blog post explores operational blind spots in the Ceph Dashboard,
focusing on active releases in 2026 (Squid and Tentacle).
It explains why HEALTH_OK and green UI indicators can mask:
The post emphasizes when operators must rely on CLI tools,
logs, and metrics instead of dashboard summaries.