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logical_disk collector

The logical_disk collector exposes metrics about logical disks (in contrast to physical disks)


Metric name prefix	`logical_disk`
Data source	Perflib
Counters	`LogicalDisk` (`Win32_PerfRawData_PerfDisk_LogicalDisk`)
Enabled by default?	Yes

Flags

`--collector.logical_disk.volume-include`

If given, a disk needs to match the include regexp in order for the corresponding disk metrics to be reported

`--collector.logical_disk.volume-exclude`

If given, a disk needs to not match the exclude regexp in order for the corresponding disk metrics to be reported

Metrics

Name	Description	Type	Labels
`windows_logical_disk_info`	A metric with a constant '1' value labeled with logical disk information	gauge	`disk`,`filesystem`,`serial_number`,`volume`,`volume_name`,`type`
`windows_logical_disk_requests_queued`	Number of requests outstanding on the disk at the time the performance data is collected	gauge	`volume`
`windows_logical_disk_avg_read_requests_queued`	Average number of read requests that were queued for the selected disk during the sample interval	gauge	`volume`
`windows_logical_disk_avg_write_requests_queued`	Average number of write requests that were queued for the selected disk during the sample interval	gauge	`volume`
`windows_logical_disk_read_bytes_total`	Rate at which bytes are transferred from the disk during read operations	counter	`volume`
`windows_logical_disk_reads_total`	Rate of read operations on the disk	counter	`volume`
`windows_logical_disk_write_bytes_total`	Rate at which bytes are transferred to the disk during write operations	counter	`volume`
`windows_logical_disk_writes_total`	Rate of write operations on the disk	counter	`volume`
`windows_logical_disk_read_seconds_total`	Seconds the disk was busy servicing read requests	counter	`volume`
`windows_logical_disk_write_seconds_total`	Seconds the disk was busy servicing write requests	counter	`volume`
`windows_logical_disk_free_bytes`	Unused space of the disk in bytes (not real time, updates every 10-15 min)	gauge	`volume`
`windows_logical_disk_size_bytes`	Total size of the disk in bytes (not real time, updates every 10-15 min)	gauge	`volume`
`windows_logical_disk_idle_seconds_total`	Seconds the disk was idle (not servicing read/write requests)	counter	`volume`
`windows_logical_disk_split_ios_total`	Number of I/Os to the disk split into multiple I/Os	counter	`volume`
`windows_logical_disk_readonly`	Whether the logical disk is read-only	gauge	`volume`

Warning about size metrics

The free_bytes and size_bytes metrics are not updated in real time and might have a delay of 10-15min. This is the same behavior as the windows performance counters.

Example metric

Query the rate of write operations to a disk

rate(windows_logical_disk_read_bytes_total{instance="localhost", volume=~"C:"}[2m])

Logical Volume information

windows_logical_disk_info{disk_id="0",filesystem="",serial_number="",type="",volume="HarddiskVolume2",volume_name=""} 1
windows_logical_disk_info{disk_id="0",filesystem="",serial_number="",type="",volume="HarddiskVolume3",volume_name=""} 1
windows_logical_disk_info{disk_id="0",filesystem="NTFS",serial_number="668EEC37",type="fixed",volume="C:",volume_name="Windows"} 1
windows_logical_disk_info{disk_id="1",filesystem="NTFS",serial_number="50AE953B",type="fixed",volume="D:",volume_name="Temporary Storage"} 1
windows_logical_disk_info{disk_id="1",filesystem="ReFS",serial_number="C69B59AD",type="fixed",volume="G:",volume_name="Volume"} 1

Useful queries

Calculate rate of total IOPS for disk

rate(windows_logical_disk_reads_total{instance="localhost", volume="C:"}[2m]) + rate(windows_logical_disk_writes_total{instance="localhost", volume="C:"}[2m])

Show volume usage (%)

100.0 - 100 * (windows_logical_disk_free_bytes{instance="localhost", volume="C:"} / windows_logical_disk_size_bytes{instance="localhost", volume="C:"})

Alerting examples

prometheus.rules

groups:
- name: Windows Disk Alerts
  rules:

  # Sends an alert when disk space usage is above 95%
  - alert: DiskSpaceUsage
    expr: 100.0 - 100 * (windows_logical_disk_free_bytes / windows_logical_disk_size_bytes) > 95
    for: 10m
    labels:
      severity: high
    annotations:
      summary: "Disk Space Usage (instance {{ $labels.instance }})"
      description: "Disk Space on Drive is used more than 95%\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

  # Alerts on disks with over 85% space usage predicted to fill within the next four days
  - alert: DiskFilling
    expr: 100 * (windows_logical_disk_free_bytes / windows_logical_disk_size_bytes) < 15 and predict_linear(windows_logical_disk_free_bytes[6h], 4 * 24 * 3600) < 0
    for: 10m
    labels:
      severity: warning
    annotations:
      summary: "Disk full in four days (instance {{ $labels.instance }})"
      description: "{{ $labels.volume }} is expected to fill up within four days. Currently {{ $value | humanize }}% is available.\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"

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