Disk Space Reference

All parameters, thresholds, and configuration options for the Disk Space check in octoja.

Written By Erdinc Akay

Last updated About 2 months ago

This article describes the available configuration options and behaviour of the Disk Space check.

Configuration fields

FieldTypeRequiredDefaultDescription
Monitor all drivesbooleanNotrueWhen enabled, every detected drive on the device is monitored automatically.
Drives to monitorarray of drive lettersNo—Shown only when Monitor all drives is off. Multi-select sourced from the device's detected drives (e.g. C:, D:).
Threshold moderadio (Absolute values / Percent values / Combined (both))YesPercent valuesChoose whether thresholds are expressed as absolute free space (MB), as used space (%), or both. In Combined (both) mode a drive only triggers when both thresholds are exceeded — the used percentage and the free space — which avoids false alarms on very large disks where a high percentage can still leave plenty of free space.
Warning — used space (%)number (0–100)Yes (when mode = Percent or Combined)80Warn when used space exceeds this percentage.
Critical — used space (%)number (0–100)Yes (when mode = Percent or Combined)90Critical when used space exceeds this percentage.
Warning — free space (MB)numberYes (when mode = Absolute or Combined)1024Warn when free space drops below this value.
Critical — free space (MB)numberYes (when mode = Absolute or Combined)512Critical when free space drops below this value.

Metrics collected

For each monitored drive the check reports:

  • Drive letter
  • Drive name (volume label, when available)
  • Free space (bytes)
  • Total capacity (bytes)
  • Per-drive result status (OK / Warning / Critical / Error)

Used space and fill percentage are derived from free and total space in the result view.

Notes

  • One check covers all monitored drives and reports a result per drive. Create separate checks only when individual drives need different thresholds.
  • System drives can fill unexpectedly due to log files and temporary files — monitor them closely.
  • By default Monitor all drives is on, so every drive detected on the device is included automatically. Turn it off to pick specific drive letters from the device's detected drives.

See also: Configure the Disk Space Check