NVMe devices collector

Monitors health metrics (estimated endurance, space capacity, critical warnings, temperature, etc.) using the nvme CLI tool.

The module uses nvme, which can only be executed by root. It uses sudo and assumes that it is configured such that the netdata user can execute nvme as root without a password.

Requirements

• Install nvme-cli.

• Add the netdata user to the /etc/sudoers file (use which nvme to find the full path to the binary):

  netdata ALL=(root) NOPASSWD: /usr/sbin/nvme

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Additionally, you may need to adjust Netdata's system unit on Linux distributions using systemd.

Note: This is an optional step. Only do this if adding netdata to /etc/sudoers didn't help.

The default CapabilityBoundingSet doesn't allow using sudo, and is quite strict in general. Resetting is not optimal, but a next-best solution given the inability to execute nvme using sudo.

As the root user, do the following:

mkdir /etc/systemd/system/netdata.service.d
echo -e '[Service]\nCapabilityBoundingSet=~' | tee /etc/systemd/system/netdata.service.d/unset-capability-bounding-set.conf
systemctl daemon-reload
systemctl restart netdata.service

Metrics

All metrics have "nvme." prefix.

Labels per scope:

• device: device.

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

Configuration

No configuration required.

Troubleshooting

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