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disk-io

Monitor Type: disk-io (Source)

Accepts Endpoints: No

Multiple Instances Allowed: Yes

Overview

This monitor reports I/O metrics about disks.

On Linux hosts, this monitor relies on the /proc filesystem. If the underlying host's /proc file system is mounted somewhere other than /proc please specify the path using the top level configuration procPath.

procPath: /proc
monitors:
 - type: disk-io

Configuration

To activate this monitor in the Smart Agent, add the following to your agent config:

monitors:  # All monitor config goes under this key
 - type: disk-io
   ...  # Additional config

For a list of monitor options that are common to all monitors, see Common Configuration.

Config option Required Type Description
disks no list of strings The devices to include/exclude. This is an overridable set. (default: [* !/^loop[0-9]+$/ !/^dm-[0-9]+$/])
counterRefreshInterval no int64 (Windows Only) The frequency that wildcards in counter paths should be expanded and how often to refresh counters from configuration. This is expressed as a duration. (default: 60s)
printValid no bool (Windows Only) Print out the configurations that match available performance counters. This used for debugging. (default: false)

Metrics

These are the metrics available for this monitor. Metrics that are categorized as container/host (default) are in bold and italics in the list below.

  • disk_merged.read (cumulative)
    (Linux Only) The number of disk reads merged into single physical disk access operations.
  • disk_merged.write (cumulative)
    (Linux Only) The number of disk writes merged into single physical disk access operations.
  • disk_octets.avg_read (gauge)
    (Windows Only) The average number of octets (bytes) read.
  • disk_octets.avg_write (gauge)
    (Windows Only) The average number of octets (bytes) written.
  • disk_octets.read (cumulative)
    (Linux Only) The number of bytes (octets) read from a disk.
  • disk_octets.write (cumulative)
    (Linux Only) The number of bytes (octets) written to a disk.
  • disk_ops.avg_read (gauge)
    (Windows Only) The average disk read queue length.
  • disk_ops.avg_write (gauge)
    (Windows Only) The average disk write queue length.
  • disk_ops.pending (gauge)
    Number of pending operations
  • disk_ops.read (cumulative)
    (Linux Only) The number of disk read operations.
  • disk_ops.total (gauge)
    (Linux Only) The number of both read and write disk operations across all disks in the last reporting interval.
  • disk_ops.write (cumulative)
    (Linux Only) The number of disk write operations.
  • disk_time.avg_read (gauge)
    (Windows Only) The average time spent reading from the disk.
  • disk_time.avg_write (gauge)
    (Windows Only) The average time spent writing to the disk
  • disk_time.read (cumulative)
    (Linux Only) The average amount of time it took to do a read operation.
  • disk_time.write (cumulative)
    (Linux Only) The average amount of time it took to do a write operation.

Non-default metrics (version 4.7.0+)

To emit metrics that are not default, you can add those metrics in the generic monitor-level extraMetrics config option. Metrics that are derived from specific configuration options that do not appear in the above list of metrics do not need to be added to extraMetrics.

To see a list of metrics that will be emitted you can run agent-status monitors after configuring this monitor in a running agent instance.

Dimensions

The following dimensions may occur on metrics emitted by this monitor. Some dimensions may be specific to certain metrics.

Name Description
disk The name of the disk that the metric describes