telegraf/plugins/inputs/smart

S.M.A.R.T. Input Plugin

Get metrics using the command line utility smartctl for S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) storage devices. SMART is a monitoring system included in computer hard disk drives (HDDs) and solid-state drives (SSDs)[1] that detects and reports on various indicators of drive reliability, with the intent of enabling the anticipation of hardware failures. See smartmontools (https://www.smartmontools.org/).

SMART information is separated between different measurements: smart_device is used for general information, while smart_attribute stores the detailed attribute information if attributes = true is enabled in the plugin configuration.

If no devices are specified, the plugin will scan for SMART devices via the following command:

smartctl --scan

Metrics will be reported from the following smartctl command:

smartctl --info --attributes --health -n <nocheck> --format=brief <device>

This plugin supports smartmontools version 5.41 and above, but v. 5.41 and v. 5.42 might require setting nocheck, see the comment in the sample configuration.

To enable SMART on a storage device run:

smartctl -s on <device>

Configuration

# Read metrics from storage devices supporting S.M.A.R.T.
[[inputs.smart]]
  ## Optionally specify the path to the smartctl executable
  # path = "/usr/bin/smartctl"

  ## On most platforms smartctl requires root access.
  ## Setting 'use_sudo' to true will make use of sudo to run smartctl.
  ## Sudo must be configured to to allow the telegraf user to run smartctl
  ## without a password.
  # use_sudo = false

  ## Skip checking disks in this power mode. Defaults to
  ## "standby" to not wake up disks that have stoped rotating.
  ## See --nocheck in the man pages for smartctl.
  ## smartctl version 5.41 and 5.42 have faulty detection of
  ## power mode and might require changing this value to
  ## "never" depending on your disks.
  # nocheck = "standby"

  ## Gather all returned S.M.A.R.T. attribute metrics and the detailed
  ## information from each drive into the `smart_attribute` measurement.
  # attributes = false

  ## Optionally specify devices to exclude from reporting.
  # excludes = [ "/dev/pass6" ]

  ## Optionally specify devices and device type, if unset
  ## a scan (smartctl --scan) for S.M.A.R.T. devices will
  ## done and all found will be included except for the
  ## excluded in excludes.
  # devices = [ "/dev/ada0 -d atacam" ]

Permissions

It's important to note that this plugin references smartctl, which may require additional permissions to execute successfully. Depending on the user/group permissions of the telegraf user executing this plugin, you may need to use sudo.

You will need the following in your telegraf config:

[[inputs.smart]]
  use_sudo = true

You will also need to update your sudoers file:

$ visudo
# Add the following line:
Cmnd_Alias SMARTCTL = /usr/bin/smartctl
telegraf  ALL=(ALL) NOPASSWD: SMARTCTL
Defaults!SMARTCTL !logfile, !syslog, !pam_session

Metrics

• smart_device:

  • tags:
    • capacity
    • device
    • device_model
    • enabled
    • health
    • serial_no
    • wwn
  • fields:
    • exit_status
    • health_ok
    • read_error_rate
    • seek_error
    • temp_c
    • udma_crc_errors

• smart_attribute:

  • tags:
    • device
    • fail
    • flags
    • id
    • name
    • serial_no
    • wwn
  • fields:
    • exit_status
    • raw_value
    • threshold
    • value
    • worst

Flags

The interpretation of the tag flags is:

• K auto-keep
• C event count
• R error rate
• S speed/performance
• O updated online
• P prefailure warning

Exit Status

The exit_status field captures the exit status of the smartctl command which is defined by a bitmask. For the interpretation of the bitmask see the man page for smartctl.

Device Names

Device names, e.g., /dev/sda, are not persistent, and may be subject to change across reboots or system changes. Instead, you can the World Wide Name (WWN) or serial number to identify devices. On Linux block devices can be referenced by the WWN in the following location: /dev/disk/by-id/.

To run smartctl with sudo create a wrapper script and use path in the configuration to execute that.

Troubleshooting

If this plugin is not working as expected for your SMART enabled device, please run these commands and include the output in a bug report:

smartctl --scan

Run the following command replacing your configuration setting for NOCHECK and the DEVICE from the previous command:

smartctl --info --health --attributes --tolerance=verypermissive --nocheck NOCHECK --format=brief -d DEVICE

Example Output

smart_device,enabled=Enabled,host=mbpro.local,device=rdisk0,model=APPLE\ SSD\ SM0512F,serial_no=S1K5NYCD964433,wwn=5002538655584d30,capacity=500277790720 udma_crc_errors=0i,exit_status=0i,health_ok=true,read_error_rate=0i,temp_c=40i 1502536854000000000
smart_attribute,serial_no=S1K5NYCD964433,wwn=5002538655584d30,id=199,name=UDMA_CRC_Error_Count,flags=-O-RC-,fail=-,host=mbpro.local,device=rdisk0 threshold=0i,raw_value=0i,exit_status=0i,value=200i,worst=200i 1502536854000000000
smart_attribute,device=rdisk0,serial_no=S1K5NYCD964433,wwn=5002538655584d30,id=240,name=Unknown_SSD_Attribute,flags=-O---K,fail=-,host=mbpro.local exit_status=0i,value=100i,worst=100i,threshold=0i,raw_value=0i 1502536854000000000