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docs(kb): drive utilization over 100% in Prometheus/Grafana is an I/O metric - #496
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… metric Troubleshooting article for vergeos_drive_util reading at or above 100% on one drive per node while the others sit near 0%. Explains that the metric reflects drive I/O load, not fullness, and points capacity alerting at vergeos_vsan_tier_used_pct or a Storage Tiers subscription instead. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Summary
New KB article:
knowledge-base/posts/prometheus-drive-util-is-io-not-capacity.md.Customers monitoring with the Prometheus exporter see
vergeos_drive_utilat or above 100% on one drive per node and read it as a full drive, or as vSAN not spreading data. The article covers:vergeos_drive_utilmeasures I/O load, not how full the drive isvergeos_vsan_tier_used_pct, or a Storage Tiers subscriptionVerification
mkdocs serve.Reviewer note
Engineering: please confirm that
vergeos_drive_utilcan exceed 100% and that it measures I/O the wayvergeos_vm_disk_utildoes. The exporter's metric list gives the drive metric no description.🤖 Generated with Claude Code