81 lines
3.5 KiB
Markdown
81 lines
3.5 KiB
Markdown
# physical_disk collector
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The physical_disk collector exposes metrics about physical disks
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Metric name prefix | `physical_disk`
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Data source | Perflib
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Counters | `physicalDisk` ([`Win32_PerfRawData_PerfDisk_physicalDisk`](https://msdn.microsoft.com/en-us/windows/hardware/aa394307(v=vs.71)))
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Enabled by default? | Yes
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## Flags
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### `--collector.physical_disk.disk-include`
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If given, a disk needs to match the include regexp in order for the corresponding disk metrics to be reported
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### `--collector.physical_disk.disk-exclude`
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If given, a disk needs to *not* match the exclude regexp in order for the corresponding disk metrics to be reported
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## Metrics
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Name | Description | Type | Labels
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-----|-------------|------|-------
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`requests_queued` | Number of requests outstanding on the disk at the time the performance data is collected | gauge | `disk`
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`read_bytes_total` | Rate at which bytes are transferred from the disk during read operations | counter | `disk`
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`reads_total` | Rate of read operations on the disk | counter | `disk`
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`write_bytes_total` | Rate at which bytes are transferred to the disk during write operations | counter | `disk`
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`writes_total` | Rate of write operations on the disk | counter | `disk`
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`read_seconds_total` | Seconds the disk was busy servicing read requests | counter | `disk`
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`write_seconds_total` | Seconds the disk was busy servicing write requests | counter | `disk`
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`free_bytes` | Unused space of the disk in bytes (not real time, updates every 10-15 min) | gauge | `disk`
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`size_bytes` | Total size of the disk in bytes (not real time, updates every 10-15 min) | gauge | `disk`
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`idle_seconds_total` | Seconds the disk was idle (not servicing read/write requests) | counter | `disk`
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`split_ios_total` | Number of I/Os to the disk split into multiple I/Os | counter | `disk`
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### Warning about size metrics
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The `free_bytes` and `size_bytes` metrics are not updated in real time and might have a delay of 10-15min.
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This is the same behavior as the windows performance counters.
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### Example metric
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Query the rate of write operations to a disk
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```
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rate(windows_physical_disk_read_bytes_total{instance="localhost", disk=~"0"}[2m])
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```
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## Useful queries
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Calculate rate of total IOPS for disk
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```
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rate(windows_physical_disk_reads_total{instance="localhost", disk=~"0"}[2m]) + rate(windows_physical_disk_writes_total{instance="localhost", disk=~"0"}[2m])
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```
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## Alerting examples
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**prometheus.rules**
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```yaml
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groups:
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- name: Windows Disk Alerts
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rules:
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# Sends an alert when disk space usage is above 95%
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- alert: DiskSpaceUsage
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expr: 100.0 - 100 * (windows_physical_disk_free_bytes / windows_physical_disk_size_bytes) > 95
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for: 10m
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labels:
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severity: high
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annotations:
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summary: "Disk Space Usage (instance {{ $labels.instance }})"
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description: "Disk Space on Drive is used more than 95%\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
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# Alerts on disks with over 85% space usage predicted to fill within the next four days
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- alert: DiskFilling
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expr: 100 * (windows_physical_disk_free_bytes / windows_physical_disk_size_bytes) < 15 and predict_linear(windows_physical_disk_free_bytes[6h], 4 * 24 * 3600) < 0
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for: 10m
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labels:
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severity: warning
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annotations:
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summary: "Disk full in four days (instance {{ $labels.instance }})"
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description: "{{ $labels.disk }} is expected to fill up within four days. Currently {{ $value | humanize }}% is available.\n VALUE = {{ $value }}\n LABELS: {{ $labels }}"
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```
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