smart

Telegraf S.M.A.R.T. 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/).

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>

Measurements

• 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/.

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
  ## with out password.
  # use_sudo = false
  #
  ## Skip checking disks in this power mode. Defaults to
  ## "standby" to not wake up disks that have stoped rotating.
  ## See --nockeck 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 storage device.
  # nocheck = "standby"
  #
  ## Gather detailed metrics for each SMART Attribute.
  ## Defaults to "false"
  ##
  # 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" ]

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

Output

Example output from an Apple SSD:

> 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
> 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