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38 lines
1.5 KiB
Markdown
38 lines
1.5 KiB
Markdown
---
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title: WindowsDiskFillingUp
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---
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## Meaning
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Free space is below the warning threshold and a linear forecast predicts the
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volume will fill within the configured horizon. Defaults use six hours of
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history, a 24-hour prediction horizon, and a one-hour alert duration.
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## Impact
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Continued growth can exhaust the volume before routine capacity maintenance,
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causing write failures or an application outage.
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## Diagnosis
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1. Inspect the free-space trend for the volume and verify local free space with
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`Get-Volume`. Windows disk space counters can lag by 10–15 minutes.
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2. Inspect the forecast using the configured selector and window, for example:
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```promql
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predict_linear(windows_logical_disk_free_bytes{job="windows_exporter", instance="host:9182", volume="C:"}[6h], 24 * 3600)
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```
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3. Identify the application, logs, backups, or temporary data causing growth.
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Check whether a recent bulk write distorted the trend or growth is sustained.
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4. Compare absolute remaining bytes with the application's write rate. A linear
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forecast is an estimate and does not model scheduled cleanup or sudden growth.
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## Mitigation
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Restore retention and rotation, reduce write growth, or expand the volume before
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it fills. Coordinate data cleanup with the owner. If the forecast reflects a
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known temporary job, verify its end time and remaining capacity before silencing
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the alert. Follow [WindowsDiskAlmostFull](../windowsdiskalmostfull/) when free
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space is already critically low.
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