NVMe devices

Plugin: go.d.plugin Module: nvme

Overview

This collector monitors the health of NVMe devices. It relies on the nvme CLI tool but avoids directly executing the binary. Instead, it utilizes ndsudo, a Netdata helper specifically designed to run privileged commands securely within the Netdata environment. This approach eliminates the need to use sudo, improving security and potentially simplifying permission management.

This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

Default Behavior

Auto-Detection

This integration doesn't support auto-detection.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per device

These metrics refer to the NVME device.

Labels:

Label	Description
device	NVMe device name

Metrics:

Metric	Dimensions	Unit
nvme.device_estimated_endurance_perc	used	%
nvme.device_available_spare_perc	spare	%
nvme.device_composite_temperature	temperature	celsius
nvme.device_io_transferred_count	read, written	bytes
nvme.device_power_cycles_count	power	cycles
nvme.device_power_on_time	power-on	seconds
nvme.device_critical_warnings_state	available_spare, temp_threshold, nvm_subsystem_reliability, read_only, volatile_mem_backup_failed, persistent_memory_read_only	state
nvme.device_unsafe_shutdowns_count	unsafe	shutdowns
nvme.device_media_errors_rate	media	errors/s
nvme.device_error_log_entries_rate	error_log	entries/s
nvme.device_warning_composite_temperature_time	wctemp	seconds
nvme.device_critical_composite_temperature_time	cctemp	seconds
nvme.device_thermal_mgmt_temp1_transitions_rate	temp1	transitions/s
nvme.device_thermal_mgmt_temp2_transitions_rate	temp2	transitions/s
nvme.device_thermal_mgmt_temp1_time	temp1	seconds
nvme.device_thermal_mgmt_temp2_time	temp2	seconds

Alerts

The following alerts are available:

Alert name	On metric	Description
nvme_device_critical_warnings_state	nvme.device_critical_warnings_state	NVMe device ${label:device} has critical warnings

Setup

Prerequisites

Install nvme-cli

See Distro Support. Install nvme-cli using your distribution's package manager.

For Netdata running in a Docker container: grant NVMe device access

Your NVMe devices need to be accessible within the Docker container for Netdata to monitor them.

Include the following option in your docker run command or add the device mapping in your docker-compose.yml file:

• docker run

  --device '/dev/nvme0n1:/dev/nvme0n1'

• docker-compose.yml

  services:
    netdata:
      devices:
        - "/dev/nvme0n1:/dev/nvme0n1"

Note: Replace /dev/nvme0n1 with your actual NVMe device name.

Configuration

File

The configuration file name for this integration is go.d/nvme.conf.

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/nvme.conf

Options

The following options can be defined globally: update_every, autodetection_retry.

Config options

Name	Description	Default	Required
update_every	Data collection frequency.	10	no
autodetection_retry	Recheck interval in seconds. Zero means no recheck will be scheduled.	0	no
timeout	nvme binary execution timeout.	2	no

Examples

Custom update_every

Allows you to override the default data collection interval.

Config

jobs:
  - name: nvme
    update_every: 5  # Collect NVMe metrics every 5 seconds

Troubleshooting

Debug Mode

To troubleshoot issues with the nvme collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

• Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

  cd /usr/libexec/netdata/plugins.d/

• Switch to the netdata user.

  sudo -u netdata -s

• Run the go.d.plugin to debug the collector:

  ./go.d.plugin -d -m nvme

Getting Logs

If you're encountering problems with the nvme collector, follow these steps to retrieve logs and identify potential issues:

• Run the command specific to your system (systemd, non-systemd, or Docker container).
• Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.

System with systemd

Use the following command to view logs generated since the last Netdata service restart:

journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep nvme

System without systemd

Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector's name:

grep nvme /var/log/netdata/collector.log

Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.

Docker Container

If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:

docker logs netdata 2>&1 | grep nvme