CephMetricceph_osd_pct_used
Percentage used of full/near full osdsDimensions:None
Available on:
Datadog (1)
Datadog (1)Interface Metrics (1)
Sources
Related Insights (2)
Full or Near-Full OSDs Trigger Performance Collapsecritical
When OSDs reach nearfull (default 85%) or full (default 95%) thresholds, Ceph begins throttling operations and can trigger rebalancing, severely degrading performance. Full OSDs prevent all writes and can cause cluster-wide unavailability.
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Unbalanced OSD Utilization Creates Hot Spotswarning
When data distribution across OSDs is significantly uneven (high variance in ceph_osd_pct_used), some OSDs become hotspots handling disproportionate load while others remain underutilized. This reduces overall cluster performance and accelerates filling of busy OSDs.
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