Overview
Collect metrics related to disk usage and IO.
Setup
Installation
The disk check is included in the Datadog Agent package, so you don’t need to install anything else on your server.
Configuration
The Disk check is enabled by default, and the Agent collects metrics on all local partitions. To configure the check with custom options, edit the disk.d/conf.yaml file, in the conf.d/ folder at the root of your Agent’s configuration directory. See the sample disk.d/conf.yaml for all available configuration options.
Note for Windows hosts
There are three scenarios where the Disk check can be used:
- Monitoring physical drives
Monitoring physical drives that are represented by a disk letter (for example. C:, D:, etc.) is supported out of the box by the disk check without any special considerations.
- Monitoring nested mount points
Monitoring mounted folders within a filesystem requires Administrator permissions. This is because the underlying Windows function call FindFirstVolumeMountPoint requires administrative permissions.
To collect those metrics without granting Administrator permissions to the Agent, use the PDH check to collect mount point metrics from the corresponding perf counters.
- Monitoring file shares
Collecting mount point metrics for file shares on Windows is only supported by using the create_mounts option in the configuration.
On Windows, each mounted folder is only visible to the user who mounted the share.
Therefore, the create_mounts option allows the Agent to create the mount points to monitor in the context of the Agent’s user.
Validation
Run the Agent’s status subcommand and look for disk under the Checks section.
Data Collected
Metrics
system.disk.free
(gauge) | The amount of disk space that is free.
Shown as byte |
system.disk.in_use
(gauge) | The amount of disk space in use as a percent of the total.
Shown as percent |
system.disk.read_time
(count) | The time in ms spent reading per device
Shown as millisecond |
system.disk.read_time_pct
(rate) | Percent of time spent reading from disk.
Shown as percent |
system.disk.total
(gauge) | The total amount of disk space.
Shown as byte |
system.disk.used
(gauge) | The amount of disk space in use.
Shown as byte |
system.disk.write_time
(count) | The time in ms spent writing per device.
Shown as millisecond |
system.disk.write_time_pct
(rate) | Percent of time spent writing to disk.
Shown as percent |
system.fs.inodes.free
(gauge) | The number of free inodes.
Shown as inode |
system.fs.inodes.in_use
(gauge) | The number of inodes in use as a fraction of the total.
Shown as fraction |
system.fs.inodes.total
(gauge) | The total number of inodes.
Shown as inode |
system.fs.inodes.used
(gauge) | The number of inodes in use.
Shown as inode |
Events
The Disk check does not include any events.
Service Checks
disk.read_write
Returns CRITICAL if filesystem is in read-only mode.
Note: This service check is not enabled by default. To enable the service check, set service_check_rw to true in the disk check’s conf.yaml file.
Statuses: ok, critical, unknownTroubleshooting
Need help? Contact Datadog support.
