Collector: Correctly handle metrics_smart_args: '-n standby'

[S-trace]

Hi.

I tried to use metrics_smart_args: '-n standby' for my spare drive which should not spin up each SMART poll, but sometimes OS wakes up this drive.

It worked, disk not spins up each collector run anymore but should be polled if OS occasionally wakes up the drive when collector runs.

I though collector will just ignore it if SMART data was not obtained, but it shows now as Status: Failed, Temperature: ∞°C, each SMART attribute became Unknown Attribute Name.

Maybe, let collector ignore disks when 'Device is in STANDBY mode, exit(2)' is present in smartctl output?

Thanks!

[kaysond]

Can you share the output of smartctl -n standby --call --json on your drive?

[S-trace]

Here it is:

root@truenas[~]# docker exec -it scrutiny-scrutiny-1 bash
root@fc81d8414699:/opt/scrutiny# smartctl -n standby --call --json /dev/sdb
smartctl 7.3 2022-02-28 r5338 [x86_64-linux-6.12.33-production+truenas] (local build)
Copyright (C) 2002-22, Bruce Allen, Christian Franke, www.smartmontools.org

=======> UNRECOGNIZED OPTION: call

Use smartctl -h to get a usage summary

And without --call option:

root@fc81d8414699:/opt/scrutiny# smartctl -n standby --json /dev/sdb
{
  "json_format_version": [
    1,
    0
  ],
  "smartctl": {
    "version": [
      7,
      3
    ],
    "svn_revision": "5338",
    "platform_info": "x86_64-linux-6.12.33-production+truenas",
    "build_info": "(local build)",
    "argv": [
      "smartctl",
      "-n",
      "standby",
      "--json",
      "/dev/sdb"
    ],
    "exit_status": 0
  },
  "local_time": {
    "time_t": 1772291024,
    "asctime": "Sat Feb 28 18:03:44 2026 MSK"
  },
  "device": {
    "name": "/dev/sdb",
    "info_name": "/dev/sdb [SAT]",
    "type": "sat",
    "protocol": "ATA"
  }
}

And another one when drive in standby mode:

root@fc81d8414699:/opt/scrutiny# smartctl -n standby --json /dev/sdb
{
  "json_format_version": [
    1,
    0
  ],
  "smartctl": {
    "version": [
      7,
      3
    ],
    "svn_revision": "5338",
    "platform_info": "x86_64-linux-6.12.33-production+truenas",
    "build_info": "(local build)",
    "argv": [
      "smartctl",
      "-n",
      "standby",
      "--json",
      "/dev/sdb"
    ],
    "messages": [
      {
        "string": "Device is in STANDBY mode, exit(2)",
        "severity": "information"
      }
    ],
    "exit_status": 2
  },
  "local_time": {
    "time_t": 1772291219,
    "asctime": "Sat Feb 28 18:06:59 2026 MSK"
  },
  "device": {
    "name": "/dev/sdb",
    "info_name": "/dev/sdb [SAT]",
    "type": "sat",
    "protocol": "ATA"
  }

[kaysond]

Whoops sorry that auto corrected. Should be --xall

[S-trace]

root@fc81d8414699:/opt/scrutiny# smartctl -n standby --xall --json /dev/sdb
{
  "json_format_version": [
    1,
    0
  ],
  "smartctl": {
    "version": [
      7,
      3
    ],
    "svn_revision": "5338",
    "platform_info": "x86_64-linux-6.12.33-production+truenas",
    "build_info": "(local build)",
    "argv": [
      "smartctl",
      "-n",
      "standby",
      "--xall",
      "--json",
      "/dev/sdb"
    ],
    "messages": [
      {
        "string": "Device is in STANDBY mode, exit(2)",
        "severity": "information"
      }
    ],
    "exit_status": 2
  },
  "local_time": {
    "time_t": 1772291366,
    "asctime": "Sat Feb 28 18:09:26 2026 MSK"
  },
  "device": {
    "name": "/dev/sdb",
    "info_name": "/dev/sdb [SAT]",
    "type": "sat",
    "protocol": "ATA"
  }
}

[kaysond]

Thanks. Do you have -n standby set for info args well?

This should be addressed by #944

[S-trace]

Here is my collector config:

root@82e1b1a5b812:/opt/scrutiny# cat config/collector.yaml
version: 1
host:
  id: "WTR-PRO"
log:
  file: '/opt/scrutiny/config/collector.log' #absolute or relative paths allowed, eg. web.log
  level: INFO
devices:
 - device: /dev/sda
   commands:
      metrics_smart_args: '-xv 188,raw16 --xall --json -T permissive'
 - device: /dev/sdb
   commands:
      metrics_smart_args: '-n standby -xv 188,raw16 --xall --json -T permissive'
 - device: /dev/sdc
   commands:
      metrics_smart_args: '-xv 188,raw16 --xall --json -T permissive'
 - device: /dev/sdd
   commands:
      metrics_smart_args: '-xv 188,raw16 --xall --json -T permissive'
api:
  endpoint: 'http://localhost:8080/'

Should I add something to the config?