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Scenario #348
Storage
Kubernetes v1.22, LVM-CSI thin provisioning

Data Corruption from Overprovisioned Thin Volumes

Under heavy load, pods reported data corruption. Storage layer had thinly provisioned LVM volumes that overcommitted disk.

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What Happened

Thin pool ran out of physical space during write bursts, leading to partial writes and corrupted files.

Diagnosis Steps
  • 1Pod logs: checksum mismatches.
  • 2Node logs: thin pool out of space.
  • 3LVM command showed 100% usage.
Root Cause

Thin provisioning wasn't monitored and exceeded safe limits.

Fix/Workaround
• Increased physical volume backing the pool.
• Set strict overcommit alerting.
Lessons Learned

Thin provisioning is risky under unpredictable loads.

How to Avoid
  • 1Monitor usage with lvdisplay, dmsetup.
  • 2Avoid thin pools in production without full monitoring.
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