smartd

SMART disk monitoring daemon

TLDR

Start smartd in the foreground

$ smartd -d

Start with a specific configuration file

$ smartd -c [/etc/smartd.conf]

Check configuration file syntax

$ smartd -q onecheck

Run once and exit (no daemon mode)

$ smartd -q onecheck -d

Set polling interval in seconds

$ smartd -i [1800]

SYNOPSIS

smartd [-d] [-c configfile] [-i interval] [-l facility] [-p pidfile] [-q opt]

smartd is a daemon that monitors SMART (Self-Monitoring, Analysis and Reporting Technology) data from ATA/SATA and SCSI/SAS hard drives and SSDs. It detects degraded drives and predicts failures before data loss occurs.The daemon polls devices at configurable intervals (default 30 minutes), logging changes to SMART attributes via syslog. It can send email alerts, run custom scripts, or execute tests when problems are detected.Configuration is stored in /etc/smartd.conf, listing devices to monitor with their options. Without a config file, smartd scans and monitors all SMART-capable devices.

PARAMETERS

-d

Run in foreground (debug mode); do not fork into background

-c file

Use specified configuration file instead of /etc/smartd.conf

-i N

Set interval between disk checks in seconds (default: 1800)

-l facility

Use specified syslog facility for logging

-p file

Write PID to specified file

-q option

Quiet mode options: errors, nodev, nodev0, never, onecheck, showtests

-r type

Report ATA errors as type (ioctl, bpt)

CONFIGURATION

/etc/smartd.conf

Main configuration file listing devices to monitor and their check options, alert actions, and test schedules.

/etc/default/smartmontools

Startup options for the smartd daemon on Debian-based systems.

INSTALL

sudo apt install smartmontools

sudo dnf install smartmontools

sudo pacman -S smartmontools

sudo apk add smartmontools

sudo zypper install smartmontools

brew install smartmontools

nix profile install nixpkgs#smartmontools

CAVEATS

smartd monitors disk health but is not a backup solution. Some USB enclosures don't pass SMART data through. Virtual drives and RAID controllers may not expose SMART to the host. Start smartd via systemd: systemctl enable --now smartd.

HISTORY

smartd is part of smartmontools, originally developed by Bruce Allen starting in 2002. The package provides open-source tools for monitoring SMART data across various drive types and operating systems.